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vigilian
Asked: 2016-09-18 03:45:26 +0800 CST

can't migrate RAID 1 to RAID10

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I have done multiple researchs before to open this post. I did find a lot of post about it but none was really link to my configuration so I open this here. I have 2 hdd in RAID 1:

Disque /dev/sdj : 558,9 GiB, 600127266816 octets, 1172123568 secteurs
Unités : sectors of 1 * 512 = 512 octets
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 5C9A14EB-BD49-435D-A136-62086235D780

Périphérique Start        Fin   Secteurs   Size Type
/dev/sdj1     2048 1172121599 1172119552 558,9G Linux filesystem

Disque /dev/sdk : 931,5 GiB, 1000204886016 octets, 1953525168 secteurs
Unités : sectors of 1 * 512 = 512 octets
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 3DCFB2AE-DABD-4B10-96AF-DB389F943DE5

Périphérique      Start        Fin   Secteurs   Size Type
/dev/sdk1          2048 1171875839 1171873792 558,8G Linux filesystem
/dev/sdk2    1171875840 1953523711  781647872 372,7G Linux filesystem

sdj1 + sdk1 = RAID1

I'm adding 2 other disks with this procedure from this [tuto]: https://ubuntuforums.org/showthread.php?t=713936 for the partitionning: 

`sfdisk /dev/sdd < partitions.sdb`

It has worked before for another RAID on the same host. So I end up with :

Disque /dev/sdg : 931,5 GiB, 1000204886016 octets, 1953525168 secteurs
Unités : sectors of 1 * 512 = 512 octets
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 3DCFB2AE-DABD-4B10-96AF-DB389F943DE5

Périphérique      Start        Fin   Secteurs   Size Type
/dev/sdg1          2048 1171875839 1171873792 558,8G Linux filesystem
/dev/sdg2    1171875840 1953523711  781647872 372,7G Linux filesystem

Disque /dev/sdi : 931,5 GiB, 1000204886016 octets, 1953525168 secteurs
Unités : sectors of 1 * 512 = 512 octets
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 3DCFB2AE-DABD-4B10-96AF-DB389F943DE5

Périphérique      Start        Fin   Secteurs   Size Type
/dev/sdi1          2048 1171875839 1171873792 558,8G Linux filesystem
/dev/sdi2    1171875840 1953523711  781647872 372,7G Linux filesystem

and so :

Personalities : [raid1] [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid10] 
md125 : inactive sdn[0]
      976224256 blocks super external:/md126/0

md126 : inactive sdn[0](S)
      538328 blocks super external:ddf

md227 : active raid6 sdl[7] sdh1[6] sde1[5] sdf1[4] sdd1[3] sdc1[0] sdb1[1]
      9766912000 blocks super 1.2 level 6, 512k chunk, algorithm 18 [7/6] [UUUUUU_]
      [=========>...........]  reshape = 46.8% (915172352/1953382400) finish=3557.0min speed=4864K/sec
      bitmap: 2/15 pages [8KB], 65536KB chunk

md127 : active raid1 sdg1[3](S) sdk1[2](S) sdj1[0] sdi1[1]
      585805824 blocks super 1.2 [2/2] [UU]
      bitmap: 4/5 pages [16KB], 65536KB chunk

unused devices: <none>

md127 is the raid1 as you see I'm growing a raid5 in a raid6 at the same time.

Why have I this: mdadm: Impossibly level change request for RAID1

with this : sudo mdadm --grow /dev/md127 --level=10 --raid-devices=4 --backup-file=/root/raid1backup

because of the growing of the RAID6? or the partitionning is not good? or is it because the raid array is mounted and busy with docker container?

server

1 Answers

  1. Best Answer

    It happens to be finally very simple because of my backup file. I hop it will help guys like me who didn't find enough documentation about how to restart a grow after a clean reboot:

    mdadm --stop /dev/md...
mdadm --assemble --backup-file location_of_backup_file  /dev/md...

    it should restore the work automatically you can verify it with

    mdadm --detail /dev/md....

    and cat /proc/mdstat

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