I tested to go from raid5 to raid6 and grow it at the same time as per an
article I read that Niel Brown wrote, but I'm having trouble.
Am I missing something?
root@swmike-test:~/mdadm-3.1.1# uname -a
Linux swmike-test 2.6.32-12-generic #16-Ubuntu SMP Wed Jan 27 18:34:19 UTC 2010 i686 GNU/Linux
root@swmike-test:~/mdadm-3.1.1# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md0 : active raid5 sdg[5](S) sdf[4](S) sde[3] sdc[1] sdb2[0]
4208896 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU]
bitmap: 0/9 pages [0KB], 128KB chunk
root@swmike-test:~/mdadm-3.1.1# ./mdadm --grow /dev/md0 --level=6 --raid-disks=5
mdadm level of /dev/md0 changed to raid6
mdadm: Need to backup 384K of critical section..
mdadm: Cannot set device shape for /dev/md0
mdadm: aborting level change
[ 7172.535609] raid5: device sde operational as raid disk 2
[ 7172.535613] raid5: device sdc operational as raid disk 1
[ 7172.535615] raid5: device sdb2 operational as raid disk 0
[ 7172.535965] raid5: allocated 4222kB for md0
[ 7172.557813] 2: w=1 pa=0 pr=4 m=2 a=18 r=4 op1=0 op2=0
[ 7172.557817] 1: w=2 pa=0 pr=4 m=2 a=18 r=4 op1=0 op2=0
[ 7172.557819] 0: w=3 pa=0 pr=4 m=2 a=18 r=4 op1=0 op2=0
[ 7172.557822] raid5: raid level 6 set md0 active with 3 out of 4 devices, algorithm 18
[ 7172.557825] RAID5 conf printout:
[ 7172.557826] --- rd:4 wd:3
[ 7172.557829] disk 0, o:1, dev:sdb2
[ 7172.557831] disk 1, o:1, dev:sdc
[ 7172.557832] disk 2, o:1, dev:sde
[ 7173.066112] raid5: device sde operational as raid disk 2
[ 7173.066115] raid5: device sdc operational as raid disk 1
[ 7173.066118] raid5: device sdb2 operational as raid disk 0
[ 7173.066424] raid5: allocated 3179kB for md0
[ 7173.101841] 2: w=1 pa=0 pr=3 m=1 a=2 r=3 op1=0 op2=0
[ 7173.101845] 1: w=2 pa=0 pr=3 m=1 a=2 r=3 op1=0 op2=0
[ 7173.101847] 0: w=3 pa=0 pr=3 m=1 a=2 r=3 op1=0 op2=0
[ 7173.101850] raid5: raid level 5 set md0 active with 3 out of 3 devices, algorithm 2
[ 7173.101852] RAID5 conf printout:
[ 7173.101853] --- rd:3 wd:3
[ 7173.101855] disk 0, o:1, dev:sdb2
[ 7173.101857] disk 1, o:1, dev:sdc
[ 7173.101859] disk 2, o:1, dev:sde
root@swmike-test:~/mdadm-3.1.1# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md0 : active raid5 sdg[5](S) sdf[4](S) sde[3] sdc[1] sdb2[0]
4208896 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU]
bitmap: 0/9 pages [0KB], 128KB chunk
So I thought I'd try to just test the level change:
root@swmike-test:~/mdadm-3.1.1# ./mdadm --grow /dev/md0 --level=6 --raid-disks=4 --backup-file=/backup-file
mdadm level of /dev/md0 changed to raid6
mdadm: Cannot set device shape for /dev/md0
mdadm: aborting level change
[ 7554.027702] raid5: device sde operational as raid disk 2
[ 7554.027705] raid5: device sdc operational as raid disk 1
[ 7554.027708] raid5: device sdb2 operational as raid disk 0
[ 7554.028067] raid5: allocated 4222kB for md0
[ 7554.040795] 2: w=1 pa=0 pr=4 m=2 a=18 r=4 op1=0 op2=0
[ 7554.040798] 1: w=2 pa=0 pr=4 m=2 a=18 r=4 op1=0 op2=0
[ 7554.040801] 0: w=3 pa=0 pr=4 m=2 a=18 r=4 op1=0 op2=0
[ 7554.040804] raid5: raid level 6 set md0 active with 3 out of 4 devices, algorithm 18
[ 7554.040806] RAID5 conf printout:
[ 7554.040808] --- rd:4 wd:3
[ 7554.040810] disk 0, o:1, dev:sdb2
[ 7554.040812] disk 1, o:1, dev:sdc
[ 7554.040814] disk 2, o:1, dev:sde
[ 7555.517552] raid5: device sde operational as raid disk 2
[ 7555.517555] raid5: device sdc operational as raid disk 1
[ 7555.517558] raid5: device sdb2 operational as raid disk 0
[ 7555.517890] raid5: allocated 3179kB for md0
[ 7555.549619] 2: w=1 pa=0 pr=3 m=1 a=2 r=3 op1=0 op2=0
[ 7555.549622] 1: w=2 pa=0 pr=3 m=1 a=2 r=3 op1=0 op2=0
[ 7555.549625] 0: w=3 pa=0 pr=3 m=1 a=2 r=3 op1=0 op2=0
[ 7555.549627] raid5: raid level 5 set md0 active with 3 out of 3 devices, algorithm 2
[ 7555.549629] RAID5 conf printout:
[ 7555.549631] --- rd:3 wd:3
[ 7555.549633] disk 0, o:1, dev:sdb2
[ 7555.549635] disk 1, o:1, dev:sdc
[ 7555.549637] disk 2, o:1, dev:sde
root@swmike-test:~/mdadm-3.1.1# ./mdadm --grow /dev/md0 --raid-disks=4
mdadm: Need to backup 384K of critical section..
mdadm: Cannot set device shape for /dev/md0: Device or resource busy
[ 7616.412076] md: couldn't update array info. -16
What could cause this? It doesn't work with the one ubuntu is shipping
either:
root@swmike-test:~# mdadm --version
mdadm - v2.6.7.1 - 15th October 2008
root@swmike-test:~# mdadm --grow /dev/md0 --raid-disks=4
mdadm: Need to backup 384K of critical section..
mdadm: Cannot set device size/shape for /dev/md0: Device or resource busy
[ 7746.764080] md: couldn't update array info. -16
--
Mikael Abrahamsson email: swmike@xxxxxxxxx
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