Hello,
I was trying to migrate from 5x3TB RAID5 to 6x3TB RAID6 with this command:
$ mdadm --grow /dev/md1 --level=6 --raid-devices=6 --
backup=/home/archiwum/r6.bak
After couple of days reshape stalled on 2147483648 block. I have found that
this is a bug in mdadm. 2147483648 is max integer on 32 bit system. For now
situation looks like this:
$ uname -a
Linux backuper 2.6.32-5-686-bigmem #1 SMP Mon Sep 23 23:38:27 UTC 2013 i686
GNU/Linux
$ mdadm --version
mdadm - v3.1.4 - 31st August 2010
$ cat /proc/mdstat
md1 : active raid6 sdi1[6] sdj1[0] sdk1[5] sdc1[4] sdf1[3] sdh1[1]
11721054208 blocks super 1.2 level 6, 512k chunk, algorithm 18 [6/5]
[UUUUU_]
[==============>......] reshape = 73.2% (2147483648/2930263552)
finish=18031577.4min speed=0K/sec
$ mdadm --detail /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Mon Nov 25 11:41:34 2013
Raid Level : raid6
Array Size : 11721054208 (11178.07 GiB 12002.36 GB)
Used Dev Size : 2930263552 (2794.52 GiB 3000.59 GB)
Raid Devices : 6
Total Devices : 6
Persistence : Superblock is persistent
Update Time : Fri Jan 3 10:26:20 2014
State : clean, degraded, recovering
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric-6
Chunk Size : 512K
Reshape Status : 73% complete
New Layout : left-symmetric
Name : backuper:1 (local to host backuper)
UUID : 5fb40412:f3447bf7:f654d5f1:1bef1e1c
Events : 4553396
Number Major Minor RaidDevice State
0 8 145 0 active sync /dev/sdj1
1 8 113 1 active sync /dev/sdh1
3 8 81 2 active sync /dev/sdf1
4 8 33 3 active sync /dev/sdc1
5 8 161 4 active sync /dev/sdk1
6 8 129 5 spare rebuilding /dev/sdi1
What should I do now? Its a production system, of course I have a backups
but I would like to avoid recovering 8TB data from backups. My idea is to
cancel reshape, and then do it again with bigger chunk, or upgrade
mdadm/kernel.
Thanks in advance for your help.
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