Uwe Doering wrote:
Eric Anderson wrote:
I get the above panic after nfs clients attach to this nfs server and
being read/write ops on it after an unclean shutdown. I've fsck'ed
the fs, and it marks it as clean, but I get this every time. It's an
NFS share of a GEOM stripe (about 2TB).
mode = 0100600, inum = 58456203, fs = /mnt
panic: ffs_valloc: dup alloc
Do you happen to have disk mirroring on this server (RAID 1)? At
work, on a workstation with RAID 1, we once had a case where after a
power failure fsck would succeed, but subsequently, when mounting and
using the partitions, the kernel still paniced because of a corrupt
filesystem. Repeatedly.
This caused some major head scratching on our part until we figured
out what was happening. The mirrored disks had gone out of sync. For
performance reasons, a RAID 1 controller reads data from one disk
drive or the other, depending on which drive is less busy in that
particular moment. So while fsck was able to find and fix some
filesystem inconsistencies there were still some more left in disk
sectors it didn't access.
The RAID controller we used turned out to have a verification mode
where it would scan the disks and re-synchronize them. Afterwards we
did another fsck run, and this fixed the remaining filesystem
inconsistencies. The kernel panics were gone.
Now, with the information you've provided I can't tell whether these
findings apply to your case, but perhaps this story helps at least
others in a similar situation.
I do have mirroring enabled on the OS drives, but this is happening with
an external fiber channel array of SATA disks, striped using gstripe.
Eric
--
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Eric Anderson Sr. Systems Administrator Centaur Technology
Anything that works is better than anything that doesn't.
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