* [linux-lvm] SUMMARY: Help! All PVs present but vgscan fails to assemble volume group
[not found] ` <20011127142920.L730@lynx.no>
@ 2001-11-27 16:40 ` Lars Kellogg-Stedman
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From: Lars Kellogg-Stedman @ 2001-11-27 16:40 UTC (permalink / raw)
To: lvm-devel, linux-lvm
Everything is working once again, and I wanted to summarize my
experience to the list in the hopes that someone else will find it helpful.
There appear to have been two problems at work here:
(1) The list compacting code in pv_read_all_pv_of_vg() is buggy, and in
common situations would lose track of some PVs. I submitted a very
simple patch for this to Heinz earlier today, but I've since put a
cleaner version up at <http://larsshack.freeservers.com/lvm/>.
(2) It looks as if the 'vgmerge' command may have trodded upon on-disk
information on /dev/md0, erasing both the LV table and the mappings for
the first 173 PEs.
Andreas provided the information I needed to manually reconstruct the
data lost due to (2). In fact, Andreas has been extraordinarily helpful
in tracking down both the cause and a solution to this problem, and I'd
like to thank him here for his time and effort.
I have not yet investigated the vgmerge problem in any detail, so I
don't know why it corrupted the on-disk data.
-- Lars
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