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Date: Sun, 17 Jul 2005 19:19:36 -0700
From: Tyler <pml@dtbb.net>
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To: linux-raid@vger.kernel.org
CC: Neil Brown <neilb@cse.unsw.edu.au>
Subject: Re: bug report: mdadm-devel-2 , superblock version 1
References: <009401c58ae6$65b57870$c200a8c0@NCNF5131FTH>	<17114.54800.132155.142544@cse.unsw.edu.au>	<00e101c58b25$6f5c06c0$c200a8c0@NCNF5131FTH>	<17114.62108.319878.983091@cse.unsw.edu.au>	<010701c58b32$ee423830$c200a8c0@NCNF5131FTH>	<17115.149.130115.176372@cse.unsw.edu.au>	<001601c58b37$620c69d0$c200a8c0@NCNF5131FTH> <17115.1749.370942.838069@cse.unsw.edu.au> <42DB0F41.7030806@dtbb.net>
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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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