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Rich Rauenzahn wrote:
> Since I heavily use lvol, I instead store a vgdisplay -v along with bdf 
> and mount output.

On the weekend I had a client with a hardware RAID array which was
configured with LVM with a single PV (4TB) and lots of logical volumes
(LV's). At some point, it crashed due to scribbling random FS data over
the first few blocks of the array. I was eventually able to recover
everything with a bit of dd (copy first few blocks to a file) and vi
(delete everything except a single copy of the lvm.conf data) and
pvcreate (restore the pv info) and vgcfgrestore (restore the rest of the
LV's).

However, what I wanted to point out to everyone, is the usefulness of
keeping a copy of your LVM information. This can be saved with
vgcfgbackup. Also, it is possible to have two copies of your LVM info on
disk, one at the beginning and one at the end. This (IMHO) would
drastically increase your chances of recovering data, since you probably
wouldn't corrupt both beginning and end of your disk. See man pvcreate
for the --metadatacopies which defaults to 1 (only at the beginning).

While I managed a successful restore, it still concerns me that LVM
seems a lot more complicated to recover from than a disk with partitions
and simple filesystems.

Regards,
Adam
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