As a side note, do I need any kernel patches to use the version 1
superblocks Neil? That may be what i'm missing.. as the kernel in use
currently is a vanilla 2.6.12.3. I'm not trying to use bitmaps or
anything else at the moment.
Tyler.
Tyler wrote:
# uname -a
Linux server 2.6.12.3 #3 SMP Sun Jul 17 14:38:12 CEST 2005 i686 GNU/Linux
# ./mdadm -V
mdadm - v2.0-devel-2 - DEVELOPMENT VERSION NOT FOR REGULAR USE - 7
July 2005
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -S /dev/md1
** stop the current array
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -C /dev/md1 -l 5
--raid-devices 3 -e 1 /dev/sda2 /dev/sdb2 /dev/sdc2
mdadm: /dev/sda2 appears to be part of a raid array:
level=5 devices=3 ctime=Mon Jul 18 03:22:05 2005
mdadm: /dev/sdb2 appears to be part of a raid array:
level=5 devices=3 ctime=Mon Jul 18 03:22:05 2005
mdadm: /dev/sdc2 appears to be part of a raid array:
level=5 devices=3 ctime=Mon Jul 18 03:22:05 2005
Continue creating array? y
mdadm: array /dev/md1 started.
** create and start new array using 3 drives, superblock version 1
root@server:~/dev/mdadm-2.0-devel-2# cat /proc/mdstat
Personalities : [raid5]
md1 : active raid5 sdc2[3] sdb2[1] sda2[0]
128384 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
unused devices: <none>
** mdstat mostly okay, except sdc2 is listed as device3 instead of
device2 (from 0,1,2)
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -D /dev/md1
/dev/md1:
Version : 01.00.01
Creation Time : Mon Jul 18 03:56:40 2005
Raid Level : raid5
Array Size : 128384 (125.40 MiB 131.47 MB)
Device Size : 64192 (62.70 MiB 65.73 MB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Mon Jul 18 03:56:42 2005
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 1baa875e87:9ec208b2:7f5e6a27:db1f5e
Events : 1
Number Major Minor RaidDevice State
0 8 2 0 active sync
/dev/.static/dev/sda2
1 8 18 1 active sync
/dev/.static/dev/sdb2
2 0 0 - removed
3 8 34 2 active sync
/dev/.static/dev/sdc2
** reports version 01.00.01 superblock, but reports as if there were 4
devices used
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -S /dev/md1
** stop the array
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -A /dev/md1
Segmentation fault
** try to assemble the array
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -D /dev/md1
mdadm: md device /dev/md1 does not appear to be active.
** check if its active at all
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -A /dev/md1 /dev/sda2
/dev/sdb2 /dev/sdc2
mdadm: device 1 in /dev/md1 has wrong state in superblock, but
/dev/sdb2 seems ok
mdadm: device 2 in /dev/md1 has wrong state in superblock, but
/dev/sdc2 seems ok
mdadm: /dev/md1 has been started with 3 drives.
** try restarting it with drive details, and it starts
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -D /dev/md1
/dev/md1:
Version : 00.90.01
Creation Time : Mon Jul 18 02:53:55 2005
Raid Level : raid5
Array Size : 128384 (125.40 MiB 131.47 MB)
Device Size : 64192 (62.70 MiB 65.73 MB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Mon Jul 18 02:53:57 2005
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : e798f37d:baf98c2f:e714b50c:8d1018b1
Events : 0.2
Number Major Minor RaidDevice State
0 8 2 0 active sync
/dev/.static/dev/sda2
1 8 18 1 active sync
/dev/.static/dev/sdb2
2 8 34 2 active sync
/dev/.static/dev/sdc2
** magically, we now have a v00.90.01 superblock, it reports the
proper list of drives
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -S /dev/md1
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -A /dev/md1
Segmentation fault
** try to stop and restart again, doesn't work
root@server:~/dev/mdadm-2.0-devel-2# ./mdadm -E /dev/sda2
/dev/sda2:
Magic : a92b4efc
Version : 01.00
Array UUID : 1baa875e87:9ec208b2:7f5e6a27:db1f5e
Name :
Creation Time : Mon Jul 18 03:56:40 2005
Raid Level : raid5
Raid Devices : 3
Device Size : 128504 (62.76 MiB 65.79 MB)
Super Offset : 128504 sectors
State : clean
Device UUID : 1baa875e87:9ec208b2:7f5e6a27:db1f5e
Update Time : Mon Jul 18 03:56:42 2005
Checksum : 903062ed - correct
Events : 1
Layout : left-symmetric
Chunk Size : 64K
Array State : Uuu 1 failed
** the drives themselves still report a version 1 superblock... wierd
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