I attempted to add a disk to an mdadm RAID 5 array with the following:
mdadm --manage /dev/md1 --add /dev/sdf1
mdadm --grow --raid-devices=5 --backup-file=/root/md1-grow.bak /dev/md1
These command gave no errors, but although mdadm reports that the array
is reshaping it does not seem to have done anything after a couple of
hours:
[root@sulphur ~]# mdadm -D /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Thu May 14 18:19:10 2015
Raid Level : raid5
Array Size : 11720656896 (11177.69 GiB 12001.95 GB)
Used Dev Size : 3906885632 (3725.90 GiB 4000.65 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Wed Oct 14 18:48:37 2015
State : clean, reshaping
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Reshape Status : 0% complete
Delta Devices : 1, (4->5)
Name : sulphur.kada-media.red:1 (local to host sulphur.kada
-media.red)
UUID : dbadf568:66ef2f61:ba13ddd6:176fb4f5
Events : 14870
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
4 8 65 3 active sync /dev/sde1
5 8 81 4 active sync /dev/sdf1
[root@sulphur ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md1 : active raid5 sdf1[5] sde1[4] sdb1[0] sdd1[2] sdc1[1]
11720656896 blocks super 1.2 level 5, 512k chunk, algorithm 2
[5/5] [UUUUU]
[>....................] reshape = 0.0% (0/3906885632)
finish=19225133047.4min speed=0K/sec
bitmap: 0/30 pages [0KB], 65536KB chunk
md0 : active raid5 sdk1[5] sdh1[1] sdi1[3] sdm1[7] sdg1[0] sdl1[4]
sdj1[2]
17580804096 blocks super 1.2 level 5, 512k chunk, algorithm 2
[7/7] [UUUUUUU]
bitmap: 0/22 pages [0KB], 65536KB chunk
unused devices: <none>
Output of dmesg:
[ 7351.071351] md: bind<sdf1>
[ 7351.398116] RAID conf printout:
[ 7351.398123] --- level:5 rd:4 wd:4
[ 7351.398127] disk 0, o:1, dev:sdb1
[ 7351.398131] disk 1, o:1, dev:sdc1
[ 7351.398134] disk 2, o:1, dev:sdd1
[ 7351.398136] disk 3, o:1, dev:sde1
[ 7420.751226] RAID conf printout:
[ 7420.751234] --- level:5 rd:5 wd:5
[ 7420.751239] disk 0, o:1, dev:sdb1
[ 7420.751242] disk 1, o:1, dev:sdc1
[ 7420.751245] disk 2, o:1, dev:sdd1
[ 7420.751248] disk 3, o:1, dev:sde1
[ 7420.751251] disk 4, o:1, dev:sdf1
[ 7420.751524] md: reshape of RAID array md1
[ 7420.751530] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
[ 7420.751534] md: using maximum available idle IO bandwidth (but not
more than 200000 KB/sec) for reshape.
[ 7420.751542] md: using 128k window, over a total of 3906885632k.
The array is used as the physical volume for a single volume group
which I deactivated before performing the mdadm grow.
Can you tell me what I should do to get the reshape to start (and
complete) or rescue the array?
Thank you in advance for any help!
Dan
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