Re: XFS report error on LVM snapshot

[dean gaudet <dean-list-linux-xfs@xxxxxxxxxx>]

On Wed, 10 Aug 2005, Tang Lingbo (Allan) wrote:

> Hi,
> 
> I get error message when I try to use LVM snapshot with XFS.
> 
> === error message ===
> XFS mounting filesystem lvm(58,4)
> Ending clean XFS mount for filesystem: lvm(58,4)
> lvm - lvm_map: ll_rw_blk write for readonly LV /dev/vg0/test21
> xfs_force_shutdown(lvm(58,4),0x1) called from line 353 of file xfs_rw.c.
> Return address = 0xc026ad2b
> Filesystem "lvm(58,4)": I/O Error Detected.  Shutting down filesystem:
> lvm(58,4)
> Please umount the filesystem, and rectify the problem(s)
> XFS mounting filesystem lvm(58,4)
> Ending clean XFS mount for filesystem: lvm(58,4)
> 
> ===================

yeah this is the same thing i reported in bugzilla:
http://oss.sgi.com/bugzilla/show_bug.cgi?id=413

unfortunately i've found xfs+snapshots to be completely unusable on any 
filesystem with non-trivial workload -- no data corruption (yet), but the 
snapshot fails regularly.  see also:

http://oss.sgi.com/bugzilla/show_bug.cgi?id=412
http://oss.sgi.com/bugzilla/show_bug.cgi?id=414

-dean