Neil Brown wrote:
>
> On Sunday May 19, cwebster@ec.rr.com wrote:
> > Looking for help from list members in resolving software RAID problems.
>
> Here is the help:
> For each device that should be part of the array (e.g. /dev/sda1)
> run
> mdadm --examine /dev/sda1
> This should show you some sensible information up to the Checksum,
> and then bad information after that.
Yup, just like you said... sensible before, nonsense after.
> Then run
> mdadm --examine --sparc2.2 /dev/sda1
> This should show you the same sensible information, and then
> sensible information after the Checksum as well.
This looks much better, but not just right. I would expect that the list
following "Chunk Size" would be close to the /etc/raidtab that was being
used prior to the Aurora upgrade when it was last working. At any rate,
the "this" device and the last device listed are definitely not correct.
I'm not sure what "this" should be, but I assume it should list
parameters for the device being queried.
What I'm getting with "mdadm --examine --sparc2.2":
The first device listed ("this") always has a minor number of "8". Major
numbers for the "this" device on each raid drive, a through f, are
4,5,0,2,3,1, respectively. I don't know if this is random or somehow
correlates to the original raid device sequence. None of these is an
actual raid device, though.
The last device listed is always:
5 0 5 8 33 faulty sync
The remaining devices in the middle of each list, although out of
sequence in terms of /etc/raidtab, have the correct major/minor device
numbers. To be honest, though, I don't remember if the device list in
/proc/mdstat prior to the Aurora upgrade actually matched /etc/raidtab
in terms of raid device numbers either. If I remember correctly, they
seemed to be reversed but it worked so I left it alone. I do distinctly
remember that, prior to the Aurora upgrade, all raid devices were
operational and there was no reconstruction in progress. The system was
virtually quiescent.
How should the spare drive show up in these lists? /dev/sdc1 is missing
from all the lists. Could this have been the actual spare?
I've included below, the complete output from "mdadm --examine
--sparc2.2" for each raid device. First, I've listed the contents of
/etc/raidtab and a long listing of the actual raid devices. Please let
me know if this makes any sense to you.
Thanks for the help!
--Cal Webster
==============================================================================================
## Contents of /etc/raidtab
------------------------------------------------
#
# 'persistent' RAID5 setup, with one spare disk:
#
raiddev /dev/md0
raid-level 5
nr-raid-disks 5
nr-spare-disks 1
persistent-superblock 1
chunk-size 128
device /dev/sdb1
raid-disk 1
device /dev/sdc1
raid-disk 2
device /dev/sdd1
raid-disk 3
device /dev/sde1
raid-disk 4
device /dev/sda1
raid-disk 0
device /dev/sdf1
spare-disk 0
------------------------------------------------
## Raid devices:
----------------------------------------------------------------------
brw-rw---- 1 root disk 8, 1 May 5 1998 sda1
brw-rw---- 1 root disk 8, 17 May 5 1998 sdb1
brw-rw---- 1 root disk 8, 33 May 5 1998 sdc1
brw-rw---- 1 root disk 8, 49 May 5 1998 sdd1
brw-rw---- 1 root disk 8, 65 Apr 16 1999 sde1
brw-rw---- 1 root disk 8, 81 Apr 16 1999 sdf1
----------------------------------------------------------------------
----------------[ mdadm --examine --sparc2.2 /dev/sda1
]----------------
/dev/sda1:
Magic : a92b4efc
Version : 00.90.00
UUID : 494dd54f:15e7b548:90bae5c3:532ac910
Creation Time : Thu Apr 26 12:29:38 2001
Raid Level : raid5
Device Size : 17681664 (16.86 GiB 18.15 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Update Time : Mon May 6 18:41:41 2002
State : clean, no-errors
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Checksum : 6515abae - correct
--- adjusting superblock for 2.2/sparc compatability ---
Events : 0.171
Layout : left-asymmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 4 8 1
0 0 8 17 1 active sync /dev/sdb1
1 1 8 81 2 active sync /dev/sdf1
2 2 8 49 3 active sync /dev/sdd1
3 3 8 65 4 active sync /dev/sde1
4 4 8 1 0 active sync /dev/sda1
5 0 5 8 33 faulty sync
----------------[ mdadm --examine --sparc2.2 /dev/sdb1
]----------------
/dev/sdb1:
Magic : a92b4efc
Version : 00.90.00
UUID : 494dd54f:15e7b548:90bae5c3:532ac910
Creation Time : Thu Apr 26 12:29:38 2001
Raid Level : raid5
Device Size : 17681664 (16.86 GiB 18.15 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Update Time : Mon May 6 18:41:41 2002
State : clean, no-errors
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Checksum : 6515abbb - correct
--- adjusting superblock for 2.2/sparc compatability ---
Events : 0.171
Layout : left-asymmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 0 8 17 faulty
0 0 8 17 1 active sync /dev/sdb1
1 1 8 81 2 active sync /dev/sdf1
2 2 8 49 3 active sync /dev/sdd1
3 3 8 65 4 active sync /dev/sde1
4 4 8 1 0 active sync /dev/sda1
5 0 5 8 33 faulty sync
----------------[ mdadm --examine --sparc2.2 /dev/sdc1
]----------------
/dev/sdc1:
Magic : a92b4efc
Version : 00.90.00
UUID : 494dd54f:15e7b548:90bae5c3:532ac910
Creation Time : Thu Apr 26 12:29:38 2001
Raid Level : raid5
Device Size : 17681664 (16.86 GiB 18.15 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Update Time : Mon May 6 18:41:41 2002
State : clean, no-errors
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Checksum : 6515abce - correct
--- adjusting superblock for 2.2/sparc compatability ---
Events : 0.171
Layout : left-asymmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 5 8 33 faulty sync
0 0 8 17 1 active sync /dev/sdb1
1 1 8 81 2 active sync /dev/sdf1
2 2 8 49 3 active sync /dev/sdd1
3 3 8 65 4 active sync /dev/sde1
4 4 8 1 0 active sync /dev/sda1
5 0 5 8 33 faulty sync
----------------[ mdadm --examine --sparc2.2 /dev/sdd1
]----------------
/dev/sdd1:
Magic : a92b4efc
Version : 00.90.00
UUID : 494dd54f:15e7b548:90bae5c3:532ac910
Creation Time : Thu Apr 26 12:29:38 2001
Raid Level : raid5
Device Size : 17681664 (16.86 GiB 18.15 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Update Time : Mon May 6 18:41:41 2002
State : clean, no-errors
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Checksum : 6515abdf - correct
--- adjusting superblock for 2.2/sparc compatability ---
Events : 0.171
Layout : left-asymmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 2 8 49 faulty active /dev/fd0h1200
0 0 8 17 1 active sync /dev/sdb1
1 1 8 81 2 active sync /dev/sdf1
2 2 8 49 3 active sync /dev/sdd1
3 3 8 65 4 active sync /dev/sde1
4 4 8 1 0 active sync /dev/sda1
5 0 5 8 33 faulty sync
----------------[ mdadm --examine --sparc2.2 /dev/sde1
]----------------
/dev/sde1:
Magic : a92b4efc
Version : 00.90.00
UUID : 494dd54f:15e7b548:90bae5c3:532ac910
Creation Time : Thu Apr 26 12:29:38 2001
Raid Level : raid5
Device Size : 17681664 (16.86 GiB 18.15 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Update Time : Mon May 6 18:41:41 2002
State : clean, no-errors
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Checksum : 6515abf1 - correct
--- adjusting superblock for 2.2/sparc compatability ---
Events : 0.171
Layout : left-asymmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 3 8 65 sync /dev/hda8
0 0 8 17 1 active sync /dev/sdb1
1 1 8 81 2 active sync /dev/sdf1
2 2 8 49 3 active sync /dev/sdd1
3 3 8 65 4 active sync /dev/sde1
4 4 8 1 0 active sync /dev/sda1
5 0 5 8 33 faulty sync
----------------[ mdadm --examine --sparc2.2 /dev/sdf1
]----------------
/dev/sdf1:
Magic : a92b4efc
Version : 00.90.00
UUID : 494dd54f:15e7b548:90bae5c3:532ac910
Creation Time : Thu Apr 26 12:29:38 2001
Raid Level : raid5
Device Size : 17681664 (16.86 GiB 18.15 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Update Time : Mon May 6 18:41:41 2002
State : clean, no-errors
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Checksum : 6515abfd - correct
--- adjusting superblock for 2.2/sparc compatability ---
Events : 0.171
Layout : left-asymmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 1 8 81 active /dev/ram8
0 0 8 17 1 active sync /dev/sdb1
1 1 8 81 2 active sync /dev/sdf1
2 2 8 49 3 active sync /dev/sdd1
3 3 8 65 4 active sync /dev/sde1
4 4 8 1 0 active sync /dev/sda1
5 0 5 8 33 faulty sync
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