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XFS: I/O Error Detected / 2.6.27.39

To: xfs@xxxxxxxxxxx
Subject: XFS: I/O Error Detected / 2.6.27.39
From: Piotr Kandziora <piotr.kandziora@xxxxxxxxxx>
Date: Tue, 16 Nov 2010 14:10:51 +0100
Cc: Janusz Bak <jb@xxxxxxxxxx>, Artur Piechocki <artur.piechocki@xxxxxxxxxx>, lukasz.wittig@xxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) Gecko/20101027 Thunderbird/3.0.10
Hi,

Our environment is following:
- we have 24GB RAM,
- we are using 3ware controller (and it does not report any errors),
- we have one big logical volume (20TB) exported via NFS with large amount of small files (about 150k), - we are doing periodically backup of this logical volume using rsync to another server.
- we have kernel 2.6.27.39,

Unfortunately our system is freezing unexpectedly without reason. We started investigating this problem and noticed that cache memory is slowly increasing.

We tried to dump this cache memory using:
/bin/echo "3" > /proc/sys/vm/drop_caches

In a result, cache was dumped, but in logs we noticed a lot of errors with XFS:

[kern.warning] kernel: xfs_iunlink_remove: xfs_inotobp() returned an error 22 on dm-16. Returning error. [kern.notice] kernel: xfs_inactive:\011xfs_ifree() returned an error = 22 on dm-16 [kern.notice] kernel: xfs_force_shutdown(dm-16,0x1) called from line 1406 of file fs/xfs/xfs_vnodeops.c. Return address = 0x [kern.alert] kernel: Filesystem \"dm-16\": I/O Error Detected. Shutting down filesystem: dm-16 [kern.alert] kernel: Please umount the filesystem, and rectify the problem(s) [kern.warning] kernel: xfs_imap_to_bp: xfs_trans_read_buf()returned an error 5 on dm-16. Returning error. [kern.warning] kernel: xfs_imap_to_bp: xfs_trans_read_buf()returned an error 5 on dm-16. Returning error. [kern.warning] kernel: xfs_imap_to_bp: xfs_trans_read_buf()returned an error 5 on dm-16. Returning error.

We are wondering if this is problem connected to hardware or rather this is XFS problem (if yes, was it fixed?).

Best regards
Piotr K

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