QNAP comandos útiles con ejemplos

more /proc/mdstat

fdisk -l

mdadm -E /dev/sda3

mdadm -E /dev/sdb3

mdadm -E /dev/sdc3

mdadm -E /dev/sdd3

Para 8 discos seguimos con mdadm -E /dev/sde3 , mdadm -E /dev/sdf3 , mdadm -E /dev/sd3 , mdadm -E /dev/sdh3 , y si son más, seguimos.

mdadm -D /dev/md0

cat /etc/raidtab

Ejemplos:

Con problemas, el raid 5 de 4 discos no aparece

[~] # more /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md4 : active raid1 sdd2[2](S) sdc2[1] sda2[0]
530048 blocks [2/2] [UU]

md13 : active raid1 sda4[0] sdd4[2] sdc4[1]
458880 blocks [4/3] [UUU_]
bitmap: 40/57 pages [160KB], 4KB chunk

md9 : active raid1 sda1[0] sdd1[2] sdc1[1]
530048 blocks [4/3] [UUU_]
bitmap: 39/65 pages [156KB], 4KB chunk

unused devices:
[~] #

[~] # fdisk -l

Disk /dev/sdd: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               1          66      530125   83  Linux
/dev/sdd2              67         132      530142   83  Linux
/dev/sdd3             133      243138  1951945693   83  Linux
/dev/sdd4          243139      243200      498012   83  Linux

Disk /dev/sdc: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1          66      530125   83  Linux
/dev/sdc2              67         132      530142   83  Linux
/dev/sdc3             133      243138  1951945693   83  Linux
/dev/sdc4          243139      243200      498012   83  Linux
You must set cylinders.
You can do this from the extra functions menu.

Disk /dev/sdya: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdya1               1      267350  2147483647+  ee  EFI GPT
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(0, 0, 1) logical=(0, 0, 2)
Partition 1 has different physical/logical endings:
phys=(1023, 254, 63) logical=(267349, 89, 4)
You must set cylinders.
You can do this from the extra functions menu.

Disk /dev/sda: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1      267350  2147483647+  ee  EFI GPT
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(0, 0, 1) logical=(0, 0, 2)
Partition 1 has different physical/logical endings:
phys=(1023, 254, 63) logical=(267349, 89, 4)

Disk /dev/sda4: 469 MB, 469893120 bytes
2 heads, 4 sectors/track, 114720 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/sda4 doesn’t contain a valid partition table

Disk /dev/sdx: 515 MB, 515899392 bytes
8 heads, 32 sectors/track, 3936 cylinders
Units = cylinders of 256 * 512 = 131072 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdx1               1          17        2160   83  Linux
/dev/sdx2              18        1910      242304   83  Linux
/dev/sdx3            1911        3803      242304   83  Linux
/dev/sdx4            3804        3936       17024    5  Extended
/dev/sdx5            3804        3868        8304   83  Linux
/dev/sdx6            3869        3936        8688   83  Linux

Disk /dev/md9: 542 MB, 542769152 bytes
2 heads, 4 sectors/track, 132512 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md9 doesn’t contain a valid partition table

Disk /dev/md4: 542 MB, 542769152 bytes
2 heads, 4 sectors/track, 132512 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md4 doesn’t contain a valid partition table
[~] #

[~] # mdadm -E /dev/sda3
/dev/sda3:
Magic : a92b4efc
Version : 00.90.00
UUID : d46b73cf:b63f7efd:94338b81:55ba1b4a
Creation Time : Thu Dec 23 13:21:36 2010
Raid Level : raid5
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 5855836800 (5584.56 GiB 5996.38 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0

Update Time : Wed Jun  5 21:07:41 2013
State : active
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Checksum : 31506936 – correct
Events : 0.7364756

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     4       8        3        4      spare   /dev/sda3

0     0       0        0        0      removed
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8        3        4      spare   /dev/sda3
[~] #

[~] # mdadm -E /dev/sdb3
mdadm: cannot open /dev/sdb3: No such device or address
[~] #

[~] # mdadm -E /dev/sdc3
/dev/sdc3:
Magic : a92b4efc
Version : 00.90.00
UUID : d46b73cf:b63f7efd:94338b81:55ba1b4a
Creation Time : Thu Dec 23 13:21:36 2010
Raid Level : raid5
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 5855836800 (5584.56 GiB 5996.38 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0

Update Time : Wed Jun  5 21:07:41 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Checksum : 31506959 – correct
Events : 0.7364756

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     2       8       35        2      active sync   /dev/sdc3

0     0       0        0        0      removed
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8        3        4      spare   /dev/sda3
[~] #

[~] # mdadm -E /dev/sdd3
/dev/sdd3:
Magic : a92b4efc
Version : 00.90.00
UUID : d46b73cf:b63f7efd:94338b81:55ba1b4a
Creation Time : Thu Dec 23 13:21:36 2010
Raid Level : raid5
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 5855836800 (5584.56 GiB 5996.38 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0

Update Time : Wed Jun  5 21:07:41 2013
State : active
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Checksum : 3150696a – correct
Events : 0.7364756

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     3       8       51        3      active sync   /dev/sdd3

0     0       0        0        0      removed
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8        3        4      spare   /dev/sda3
[~] #

[~] # mdadm -D /dev/md0
mdadm: md device /dev/md0 does not appear to be active.
[~] #

[~] # cat /etc/raidtab
raiddev /dev/md0
raid-level    5
nr-raid-disks    4
nr-spare-disks    0
chunk-size    4
persistent-superblock    1
device    /dev/sda3
raid-disk    0
device    /dev/sdb3
raid-disk    1
device    /dev/sdc3
raid-disk    2
device    /dev/sdd3
raid-disk    3
[~] #

En proceso de reconstrucción de un raid 5 de 4 discos

[~] # more /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md0 : active raid5 sda3[4] sdd3[3] sdc3[2] sdb3[1]
8786092800 blocks level 5, 64k chunk, algorithm 2 [4/3] [_UUU]
[=====>……………]  recovery = 26.1% (766015884/2928697600) finish=1054.1min speed=34193K/sec

md4 : active raid1 sda2[2](S) sdd2[0] sdc2[3](S) sdb2[1]
530048 blocks [2/2] [UU]

md13 : active raid1 sda4[0] sdc4[3] sdd4[2] sdb4[1]
458880 blocks [4/4] [UUUU]
bitmap: 0/57 pages [0KB], 4KB chunk

md9 : active raid1 sda1[0] sdd1[3] sdc1[2] sdb1[1]
530048 blocks [4/4] [UUUU]
bitmap: 1/65 pages [4KB], 4KB chunk

unused devices:
[~] #

~] # fdisk -l
You must set cylinders.
You can do this from the extra functions menu.

Disk /dev/sdd: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               1      267350  2147483647+  ee  EFI GPT
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(0, 0, 1) logical=(0, 0, 2)
Partition 1 has different physical/logical endings:
phys=(1023, 254, 63) logical=(267349, 89, 4)
You must set cylinders.
You can do this from the extra functions menu.

Disk /dev/sdc: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1      267350  2147483647+  ee  EFI GPT
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(0, 0, 1) logical=(0, 0, 2)
Partition 1 has different physical/logical endings:
phys=(1023, 254, 63) logical=(267349, 89, 4)
You must set cylinders.
You can do this from the extra functions menu.

Disk /dev/sdb: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1      267350  2147483647+  ee  EFI GPT
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(0, 0, 1) logical=(0, 0, 2)
Partition 1 has different physical/logical endings:
phys=(1023, 254, 63) logical=(267349, 89, 4)

Disk /dev/sdx: 515 MB, 515899392 bytes
8 heads, 32 sectors/track, 3936 cylinders
Units = cylinders of 256 * 512 = 131072 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdx1               1          17        2160   83  Linux
/dev/sdx2              18        1910      242304   83  Linux
/dev/sdx3            1911        3803      242304   83  Linux
/dev/sdx4            3804        3936       17024    5  Extended
/dev/sdx5            3804        3868        8304   83  Linux
/dev/sdx6            3869        3936        8688   83  Linux

Disk /dev/md9: 542 MB, 542769152 bytes
2 heads, 4 sectors/track, 132512 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md9 doesn’t contain a valid partition table

Disk /dev/md4: 542 MB, 542769152 bytes
2 heads, 4 sectors/track, 132512 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md4 doesn’t contain a valid partition table

Disk /dev/md0: 0 MB, 0 bytes
2 heads, 4 sectors/track, 0 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md0 doesn’t contain a valid partition table
You must set cylinders.
You can do this from the extra functions menu.

Disk /dev/sda: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1      267350  2147483647+  ee  EFI GPT
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(0, 0, 1) logical=(0, 0, 2)
Partition 1 has different physical/logical endings:
phys=(1023, 254, 63) logical=(267349, 89, 4)

Disk /dev/sda4: 469 MB, 469893120 bytes
2 heads, 4 sectors/track, 114720 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/sda4 doesn’t contain a valid partition table
[~] #

[~] # mdadm -E /dev/sda3
/dev/sda3:
Magic : a92b4efc
Version : 00.90.00
UUID : 9d56f3ad:0f6c7547:e7feb5d1:0092c6c8
Creation Time : Wed Dec 22 12:34:02 2010
Raid Level : raid5
Used Dev Size : 2928697600 (2793.02 GiB 2998.99 GB)
Array Size : 8786092800 (8379.07 GiB 8996.96 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0

Update Time : Wed Jun  5 23:07:18 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Checksum : 8bd3aa41 – correct
Events : 0.17507

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     4       8        3        4      spare   /dev/sda3

0     0       0        0        0      removed
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8        3        4      spare   /dev/sda3
[~] #

[~] # mdadm -E /dev/sdb3
/dev/sdb3:
Magic : a92b4efc
Version : 00.90.00
UUID : 9d56f3ad:0f6c7547:e7feb5d1:0092c6c8
Creation Time : Wed Dec 22 12:34:02 2010
Raid Level : raid5
Used Dev Size : 2928697600 (2793.02 GiB 2998.99 GB)
Array Size : 8786092800 (8379.07 GiB 8996.96 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0

Update Time : Wed Jun  5 23:18:18 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Checksum : 8bd3aed1 – correct
Events : 0.17753

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     1       8       19        1      active sync   /dev/sdb3

0     0       0        0        0      removed
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8        3        4      spare   /dev/sda3
[~] #

[~] # mdadm -E /dev/sdc3
/dev/sdc3:
Magic : a92b4efc
Version : 00.90.00
UUID : 9d56f3ad:0f6c7547:e7feb5d1:0092c6c8
Creation Time : Wed Dec 22 12:34:02 2010
Raid Level : raid5
Used Dev Size : 2928697600 (2793.02 GiB 2998.99 GB)
Array Size : 8786092800 (8379.07 GiB 8996.96 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0

Update Time : Wed Jun  5 23:21:59 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Checksum : 8bd3b060 – correct
Events : 0.17833

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     2       8       35        2      active sync   /dev/sdc3

0     0       0        0        0      removed
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8        3        4      spare   /dev/sda3
[~] #

[~] # mdadm -E /dev/sdd3
/dev/sdd3:
Magic : a92b4efc
Version : 00.90.00
UUID : 9d56f3ad:0f6c7547:e7feb5d1:0092c6c8
Creation Time : Wed Dec 22 12:34:02 2010
Raid Level : raid5
Used Dev Size : 2928697600 (2793.02 GiB 2998.99 GB)
Array Size : 8786092800 (8379.07 GiB 8996.96 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0

Update Time : Wed Jun  5 23:25:08 2013
State : active
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Checksum : 8bd36bc9 – correct
Events : 0.17901

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     3       8       51        3      active sync   /dev/sdd3

0     0       0        0        0      removed
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8        3        4      spare   /dev/sda3
[~] #

[~] # mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Wed Dec 22 12:34:02 2010
Raid Level : raid5
Array Size : 8786092800 (8379.07 GiB 8996.96 GB)
Used Dev Size : 2928697600 (2793.02 GiB 2998.99 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Thu Jun  6 00:51:25 2013
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1

Layout : left-symmetric
Chunk Size : 64K

Rebuild Status : 36% complete

UUID : 9d56f3ad:0f6c7547:e7feb5d1:0092c6c8
Events : 0.20114

Number   Major   Minor   RaidDevice State
4       8        3        0      spare rebuilding   /dev/sda3
1       8       19        1      active sync   /dev/sdb3
2       8       35        2      active sync   /dev/sdc3
3       8       51        3      active sync   /dev/sdd3
[~] #

[~] # cat /etc/raidtab
raiddev /dev/md0
raid-level    5
nr-raid-disks    4
nr-spare-disks    0
chunk-size    4
persistent-superblock    1
device    /dev/sda3
raid-disk    0
device    /dev/sdb3
raid-disk    1
device    /dev/sdc3
raid-disk    2
device    /dev/sdd3
raid-disk    3
[~] #

Funcionando con raid 5 de 8 discos

[~] # more /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md0 : active raid5 sda3[0] sdh3[7] sdg3[6] sdf3[5] sde3[4] sdd3[3] sdc3[2] sdb3[1]
10244987200 blocks level 5, 64k chunk, algorithm 2 [8/8] [UUUUUUUU]

md8 : active raid1 sdh2[2](S) sdg2[3](S) sdf2[4](S) sde2[5](S) sdd2[6](S) sdc2[7](S) sdb2[1] sda2[0]
530048 blocks [2/2] [UU]

md13 : active raid1 sda4[0] sdh4[7] sdg4[6] sdf4[5] sde4[4] sdd4[3] sdc4[2] sdb4[1]
458880 blocks [8/8] [UUUUUUUU]
bitmap: 0/57 pages [0KB], 4KB chunk

md9 : active raid1 sda1[0] sdh1[7] sde1[6] sdd1[5] sdg1[4] sdf1[3] sdc1[2] sdb1[1]
530048 blocks [8/8] [UUUUUUUU]
bitmap: 0/65 pages [0KB], 4KB chunk

unused devices:
[~] #

[~] # fdisk -l

Disk /dev/sde: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sde1               1          66      530125   83  Linux
/dev/sde2              67         132      530142   83  Linux
/dev/sde3             133      243138  1951945693   83  Linux
/dev/sde4          243139      243200      498012   83  Linux

Disk /dev/sdf: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdf1               1          66      530125   83  Linux
/dev/sdf2              67         132      530142   83  Linux
/dev/sdf3             133      243138  1951945693   83  Linux
/dev/sdf4          243139      243200      498012   83  Linux

Disk /dev/sdg: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdg1               1          66      530125   83  Linux
/dev/sdg2              67         132      530142   83  Linux
/dev/sdg3             133      243138  1951945693   83  Linux
/dev/sdg4          243139      243200      498012   83  Linux

Disk /dev/sdh: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdh1               1          66      530125   83  Linux
/dev/sdh2              67         132      530142   83  Linux
/dev/sdh3             133      243138  1951945693   83  Linux
/dev/sdh4          243139      243200      498012   83  Linux

Disk /dev/sdc: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1          66      530125   83  Linux
/dev/sdc2              67         132      530142   83  Linux
/dev/sdc3             133      243138  1951945693   83  Linux
/dev/sdc4          243139      243200      498012   83  Linux

Disk /dev/sdb: 1500.3 GB, 1500301910016 bytes
255 heads, 63 sectors/track, 182401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1          66      530125   83  Linux
/dev/sdb2              67         132      530142   83  Linux
/dev/sdb3             133      182338  1463569693   83  Linux
/dev/sdb4          182339      182400      498012   83  Linux

Disk /dev/sdd: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               1          66      530125   83  Linux
/dev/sdd2              67         132      530142   83  Linux
/dev/sdd3             133      243138  1951945693   83  Linux
/dev/sdd4          243139      243200      498012   83  Linux

Disk /dev/sda: 1500.3 GB, 1500301910016 bytes
255 heads, 63 sectors/track, 182401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1          66      530125   83  Linux
/dev/sda2              67         132      530142   83  Linux
/dev/sda3             133      182338  1463569693   83  Linux
/dev/sda4          182339      182400      498012   83  Linux

Disk /dev/sda4: 469 MB, 469893120 bytes
2 heads, 4 sectors/track, 114720 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/sda4 doesn’t contain a valid partition table

Disk /dev/sdx: 515 MB, 515899392 bytes
8 heads, 32 sectors/track, 3936 cylinders
Units = cylinders of 256 * 512 = 131072 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdx1               1          17        2160   83  Linux
/dev/sdx2              18        1910      242304   83  Linux
/dev/sdx3            1911        3803      242304   83  Linux
/dev/sdx4            3804        3936       17024    5  Extended
/dev/sdx5            3804        3868        8304   83  Linux
/dev/sdx6            3869        3936        8688   83  Linux

Disk /dev/md9: 542 MB, 542769152 bytes
2 heads, 4 sectors/track, 132512 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md9 doesn’t contain a valid partition table

Disk /dev/md8: 542 MB, 542769152 bytes
2 heads, 4 sectors/track, 132512 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md8 doesn’t contain a valid partition table

Disk /dev/md0: 10490.8 GB, 10490866892800 bytes
2 heads, 4 sectors/track, -1733720496 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md0 doesn’t contain a valid partition table
[~] #

[~] # mdadm -E /dev/sda3
/dev/sda3:
Magic : a92b4efc
Version : 00.90.00
UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:09:13 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : c1bb0e0b – correct
Events : 0.23432693

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     0       8        3        0      active sync   /dev/sda3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdb3
/dev/sdb3:
Magic : a92b4efc
Version : 00.90.00
UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:19:22 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : c1bb107e – correct
Events : 0.23432693

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     1       8       19        1      active sync   /dev/sdb3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdc3
/dev/sdc3:
Magic : a92b4efc
Version : 00.90.00
UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:22:38 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : c1bb1154 – correct
Events : 0.23432693

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     2       8       35        2      active sync   /dev/sdc3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdd3
/dev/sdd3:
Magic : a92b4efc
Version : 00.90.00
UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:25:51 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : c1bb1227 – correct
Events : 0.23432693

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     3       8       51        3      active sync   /dev/sdd3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sde3
/dev/sde3:
Magic : a92b4efc
Version : 00.90.00
UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:30:42 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : c1bb135c – correct
Events : 0.23432693

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     4       8       67        4      active sync   /dev/sde3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdf3
/dev/sdf3:
Magic : a92b4efc
Version : 00.90.00
UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:31:09 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : c1bb1389 – correct
Events : 0.23432693

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     5       8       83        5      active sync   /dev/sdf3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

~] # mdadm -E /dev/sdg3
/dev/sdg3:
Magic : a92b4efc
Version : 00.90.00
UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:31:34 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : c1bb13b4 – correct
Events : 0.23432693

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     6       8       99        6      active sync   /dev/sdg3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdh3
/dev/sdh3:
Magic : a92b4efc
Version : 00.90.00
UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:31:58 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : c1bb13de – correct
Events : 0.23432693

Layout : left-symmetric
Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     7       8      115        7      active sync   /dev/sdh3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

~] # mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Wed Mar  9 14:34:57 2011
Raid Level : raid5
Array Size : 10244987200 (9770.38 GiB 10490.87 GB)
Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Thu Jun  6 00:52:46 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 64K

UUID : 478da556:4bba431a:8e29dce8:fdee62fd
Events : 0.23432693

Number   Major   Minor   RaidDevice State
0       8        3        0      active sync   /dev/sda3
1       8       19        1      active sync   /dev/sdb3
2       8       35        2      active sync   /dev/sdc3
3       8       51        3      active sync   /dev/sdd3
4       8       67        4      active sync   /dev/sde3
5       8       83        5      active sync   /dev/sdf3
6       8       99        6      active sync   /dev/sdg3
7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # cat /etc/raidtab
raiddev /dev/md0
raid-level    5
nr-raid-disks    8
nr-spare-disks    0
chunk-size    4
persistent-superblock    1
device    /dev/sda3
raid-disk    0
device    /dev/sdb3
raid-disk    1
device    /dev/sdc3
raid-disk    2
device    /dev/sdd3
raid-disk    3
device    /dev/sde3
raid-disk    4
device    /dev/sdf3
raid-disk    5
device    /dev/sdg3
raid-disk    6
device    /dev/sdh3
raid-disk    7
[~] #

Funcionando con raid 6 de 8 discos

[~] # more /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md0 : active raid6 sda3[0] sdh3[7] sdg3[6] sdf3[5] sde3[4] sdd3[3] sdc3[2] sdb3[1]
11711673600 blocks level 6, 64k chunk, algorithm 2 [8/8] [UUUUUUUU]

md8 : active raid1 sdh2[2](S) sdg2[3](S) sdf2[4](S) sde2[5](S) sdd2[6](S) sdc2[7](S) sdb2[1] sda2[0]
530048 blocks [2/2] [UU]

md13 : active raid1 sda4[0] sdh4[7] sdg4[6] sdf4[5] sde4[4] sdd4[3] sdc4[2] sdb4[1]
458880 blocks [8/8] [UUUUUUUU]
bitmap: 0/57 pages [0KB], 4KB chunk

md9 : active raid1 sda1[0] sdh1[7] sdf1[6] sdg1[5] sde1[4] sdd1[3] sdc1[2] sdb1[1]
530048 blocks [8/8] [UUUUUUUU]
bitmap: 3/65 pages [12KB], 4KB chunk

unused devices:
[~] #

[~] # fdisk -l

Disk /dev/sde: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sde1               1          66      530125   83  Linux
/dev/sde2              67         132      530142   83  Linux
/dev/sde3             133      243138  1951945693   83  Linux
/dev/sde4          243139      243200      498012   83  Linux

Disk /dev/sdf: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdf1               1          66      530125   83  Linux
/dev/sdf2              67         132      530142   83  Linux
/dev/sdf3             133      243138  1951945693   83  Linux
/dev/sdf4          243139      243200      498012   83  Linux

Disk /dev/sdg: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdg1               1          66      530125   83  Linux
/dev/sdg2              67         132      530142   83  Linux
/dev/sdg3             133      243138  1951945693   83  Linux
/dev/sdg4          243139      243200      498012   83  Linux

Disk /dev/sdh: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdh1               1          66      530125   83  Linux
/dev/sdh2              67         132      530142   83  Linux
/dev/sdh3             133      243138  1951945693   83  Linux
/dev/sdh4          243139      243200      498012   83  Linux

Disk /dev/sdd: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               1          66      530125   83  Linux
/dev/sdd2              67         132      530142   83  Linux
/dev/sdd3             133      243138  1951945693   83  Linux
/dev/sdd4          243139      243200      498012   83  Linux

Disk /dev/sdb: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1          66      530125   83  Linux
/dev/sdb2              67         132      530142   83  Linux
/dev/sdb3             133      243138  1951945693   83  Linux
/dev/sdb4          243139      243200      498012   83  Linux

Disk /dev/sdc: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1          66      530125   83  Linux
/dev/sdc2              67         132      530142   83  Linux
/dev/sdc3             133      243138  1951945693   83  Linux
/dev/sdc4          243139      243200      498012   83  Linux

Disk /dev/sda: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1          66      530125   83  Linux
/dev/sda2              67         132      530142   83  Linux
/dev/sda3             133      243138  1951945693   83  Linux
/dev/sda4          243139      243200      498012   83  Linux

Disk /dev/sda4: 469 MB, 469893120 bytes
2 heads, 4 sectors/track, 114720 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/sda4 doesn’t contain a valid partition table

Disk /dev/sdx: 515 MB, 515899392 bytes
8 heads, 32 sectors/track, 3936 cylinders
Units = cylinders of 256 * 512 = 131072 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdx1               1          17        2160   83  Linux
/dev/sdx2              18        1910      242304   83  Linux
/dev/sdx3            1911        3803      242304   83  Linux
/dev/sdx4            3804        3936       17024    5  Extended
/dev/sdx5            3804        3868        8304   83  Linux
/dev/sdx6            3869        3936        8688   83  Linux

Disk /dev/md9: 542 MB, 542769152 bytes
2 heads, 4 sectors/track, 132512 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md9 doesn’t contain a valid partition table

Disk /dev/md8: 542 MB, 542769152 bytes
2 heads, 4 sectors/track, 132512 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md8 doesn’t contain a valid partition table

Disk /dev/md0: 11992.7 GB, 11992753766400 bytes
2 heads, 4 sectors/track, -1367048896 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md0 doesn’t contain a valid partition table
[~] #

[~] # mdadm -E /dev/sda3
/dev/sda3:
Magic : a92b4efc
Version : 00.90.00
UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:10:11 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : e424ef27 – correct
Events : 0.3789835

Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     0       8        3        0      active sync   /dev/sda3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdb3
/dev/sdb3:
Magic : a92b4efc
Version : 00.90.00
UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:16:04 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : e424f09a – correct
Events : 0.3789835

Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     1       8       19        1      active sync   /dev/sdb3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdc3
/dev/sdc3:
Magic : a92b4efc
Version : 00.90.00
UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:23:14 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : e424f25a – correct
Events : 0.3789835

Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     2       8       35        2      active sync   /dev/sdc3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdd3
/dev/sdd3:
Magic : a92b4efc
Version : 00.90.00
UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:26:29 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : e424f32f – correct
Events : 0.3789835

Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     3       8       51        3      active sync   /dev/sdd3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sde3
/dev/sde3:
Magic : a92b4efc
Version : 00.90.00
UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:33:04 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : e424f4cc – correct
Events : 0.3789835

Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     4       8       67        4      active sync   /dev/sde3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdf3
/dev/sdf3:
Magic : a92b4efc
Version : 00.90.00
UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:33:26 2013
State : active
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : e3eb20e9 – correct
Events : 0.3789836

Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     5       8       83        5      active sync   /dev/sdf3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdg3
/dev/sdg3:
Magic : a92b4efc
Version : 00.90.00
UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:33:47 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : e424f51b – correct
Events : 0.3789835

Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     6       8       99        6      active sync   /dev/sdg3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -E /dev/sdh3
/dev/sdh3:
Magic : a92b4efc
Version : 00.90.00
UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0

Update Time : Wed Jun  5 23:34:05 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Checksum : e424f53f – correct
Events : 0.3789835

Chunk Size : 64K

Number   Major   Minor   RaidDevice State
this     7       8      115        7      active sync   /dev/sdh3

0     0       8        3        0      active sync   /dev/sda3
1     1       8       19        1      active sync   /dev/sdb3
2     2       8       35        2      active sync   /dev/sdc3
3     3       8       51        3      active sync   /dev/sdd3
4     4       8       67        4      active sync   /dev/sde3
5     5       8       83        5      active sync   /dev/sdf3
6     6       8       99        6      active sync   /dev/sdg3
7     7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Wed Dec 12 04:34:21 2012
Raid Level : raid6
Array Size : 11711673600 (11169.12 GiB 11992.75 GB)
Used Dev Size : 1951945600 (1861.52 GiB 1998.79 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Thu Jun  6 00:56:45 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0

Chunk Size : 64K

UUID : fd2c41b5:17649ac4:1e10b251:f1136e44
Events : 0.3789835

Number   Major   Minor   RaidDevice State
0       8        3        0      active sync   /dev/sda3
1       8       19        1      active sync   /dev/sdb3
2       8       35        2      active sync   /dev/sdc3
3       8       51        3      active sync   /dev/sdd3
4       8       67        4      active sync   /dev/sde3
5       8       83        5      active sync   /dev/sdf3
6       8       99        6      active sync   /dev/sdg3
7       8      115        7      active sync   /dev/sdh3
[~] #

[~] # cat /etc/raidtab
raiddev /dev/md0
raid-level    6
nr-raid-disks    8
nr-spare-disks    0
chunk-size    4
persistent-superblock    1
device    /dev/sda3
raid-disk    0
device    /dev/sdb3
raid-disk    1
device    /dev/sdc3
raid-disk    2
device    /dev/sdd3
raid-disk    3
device    /dev/sde3
raid-disk    4
device    /dev/sdf3
raid-disk    5
device    /dev/sdg3
raid-disk    6
device    /dev/sdh3
raid-disk    7
[~] #