04-03-2013
Typically you only need to worry about /etc/lvm if you're doing something super special like tagging or filtering. How were the volumes presented before? If they were on SAN LUN's or something you should be able to see the same logical volumes in the output of "lvs". Basically, if everything else is working how it should there isn't anything you should HAVE to do for the LVM portion, it should just work.
The most likely culprits are:
1) The LUN's aren't being presented to the system at all. I would do a "ls -l /dev/disk/by-path" to see if you can see all the volumes you're expecting to see on the system.
2) If the volumes acting as the physical volumes are indeed there, check to see if there's an LVM filter in place. If there's pathing to the same volume (like in switch fibre channel, for instance) admins will configure lvm to skip certain volumes so they don't constantly see annoying messages about duplicate volumes and they can be sure LVM is fault tolerant. If the volumes are being filtered out because they're restricting to a pathing solution that hasn't been set up yet, that could also cause your issue.
3) If they're iSCSI LUN's you may have to log into the target so that it maps the LUN's to block devices and so gives LVM something to look at (you'll have to manually tell it to pvscan after the LUN's are presented, though).
etc, etc. There's an almost infinite number of permutations on what could be happening but the above should give you an indication of what lower-level stuff could cause LVM to stop working if the lower level system failed.
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VGREDUCE(8) System Manager's Manual VGREDUCE(8)
NAME
vgreduce - reduce a volume group
SYNOPSIS
vgreduce [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi-
calVolumePath...]
DESCRIPTION
vgreduce allows you to remove one or more unused physical volumes from a volume group.
OPTIONS
See lvm for common options.
-a, --all
Removes all empty physical volumes if none are given on command line.
--removemissing
Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes normal
operation of the volume group (new logical volumes may again be created, changed and so on).
If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove
them manually, you can run this option with --force to have vgreduce remove any partial LVs.
Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those parts
that lie on disks that are still present.
If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti-
vating your logical volumes with --partial as described in lvm (8).
SEE ALSO
lvm(8), vgextend(8)
Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) VGREDUCE(8)