Hi,
I have problem with reshaping a RAID6. I had a drive failure in 8 disk RAID6, and since I
don't need that much space anymore I decided to shrink array instead of buying replacement
disk. I executed following commands:
e2fsck -f /dev/md2
mdadm --grow -n7 /dev/md2
mdadm: this change will reduce the size of the array.
use --grow --array-size first to truncate array.
e.g. mdadm --grow /dev/md2 --array-size 14650664960
resize2fs /dev/md2 3500000000
mdadm /dev/md2 --grow --array-size=14650664960
e2fsck -f /dev/md2
mdadm --grow -n7 /dev/md2 --backup-file /root/mdadm-md2.backup
There was no errors and 'cat /proc/mdstat' reports reshape in progress:
Personalities : [raid6] [raid5] [raid4]
md2 : active raid6 sde1[1] sdn1[8] sdb1[9] sdr1[11] sdp1[10] sdl1[4] sdi1[3]
14650664960 blocks super 1.2 level 6, 512k chunk, algorithm 2 [7/6] [_UUUUUU]
[>....................] reshape = 0.0% (1/2930132992) finish=9641968871.8min speed=0K/sec
bitmap: 22/22 pages [88KB], 65536KB chunk
unused devices: <none>
The problem is that there was no progress for more than an hour, the reshaping has stopped
at the fist chunk. Is this a bug or is it not possible to reshape degraded RAID? What
shall I do with the array, can I abort the reshape or is it going to reshape eventually?
Output of "mdadm --detail /dev/md2":
/dev/md2:
Version : 1.2
Creation Time : Sun Oct 19 22:10:51 2014
Raid Level : raid6
Array Size : 14650664960 (13971.96 GiB 15002.28 GB)
Used Dev Size : 2930132992 (2794.39 GiB 3000.46 GB)
Raid Devices : 7
Total Devices : 7
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Fri Apr 7 08:38:29 2017
State : clean, degraded, reshaping
Active Devices : 7
Working Devices : 7
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Reshape Status : 0% complete
Delta Devices : -1, (8->7)
Name : borox:2 (local to host borox)
UUID : 216515ea:4a08e3b7:022786cd:534b5f0f
Events : 148046
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 65 1 active sync /dev/sde1
3 8 129 2 active sync /dev/sdi1
4 8 177 3 active sync /dev/sdl1
10 8 241 4 active sync /dev/sdp1
11 65 17 5 active sync /dev/sdr1
9 8 17 6 active sync /dev/sdb1
8 8 209 7 active sync /dev/sdn1
Thanks,
Victor
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