This is very useful information. I appreciate it Bryn. The link to the
presentation was also particularly valuable.
Now, having read your post, I need to ask: instead of
recovering/moving data off the partial VG, is there a way to just
shrink the existing VG by the size of the missing PV and carry on?
If I set up a loop device and did a pvcreate --uuid, then
vgcfgrestore, vgscan and finally activated the VG and fsck'd the LV,
could I then shrink the filesystem and remove the replacement loop VG?
P.S.
Using LVM2 2.02.70 here and I can't seem to pvcreate on loop:
# pvcreate /dev/loop0
Device /dev/loop0 not found (or ignored by filtering).
# ls -l /dev/loop*
brw-rw---- 1 root disk 7, 0 Sep 2 11:24 /dev/loop0
brw-rw---- 1 root disk 7, 1 Sep 2 09:31 /dev/loop1
brw-rw---- 1 root disk 7, 2 Sep 2 09:31 /dev/loop2
brw-rw---- 1 root disk 7, 3 Sep 2 09:31 /dev/loop3
brw-rw---- 1 root disk 7, 4 Sep 2 09:31 /dev/loop4
brw-rw---- 1 root disk 7, 5 Sep 2 09:31 /dev/loop5
brw-rw---- 1 root disk 7, 6 Sep 2 09:31 /dev/loop6
brw-rw---- 1 root disk 7, 7 Sep 2 09:31 /dev/loop7
# grep -w filter /etc/lvm/lvm.conf
# A filter that tells LVM2 to only use a restricted set of devices.
# The filter consists of an array of regular expressions. These
# Don't have more than one filter line active at once: only one gets used.
filter = [ "a/.*/" ]
# filter = [ "r|/dev/cdrom|" ]
#filter = [ "a/loop/", "r/.*/" ]
# filter =[ "a|loop|", "r|/dev/hdc|", "a|/dev/ide|", "r|.*|" ]
# filter = [ "a|^/dev/hda8$|", "r/.*/" ]
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