On 1/6/2014 7:59 AM, Tanstaafl wrote:
On 2013-12-30 8:03 AM, Tanstaafl <tanstaafl@libertytrek.org> wrote:
Hello,
Due to a misunderstanding about how LVM snapshots work when I set up
this system, I now need to delete an LV I had created to use for this
purpose (I thought I had to pre-create the LV).
Currently I have:
# lvscan
ACTIVE '/dev/vg/tmp' [5.00 GiB] inherit
ACTIVE '/dev/vg/log' [5.00 GiB] inherit
ACTIVE '/dev/vg/vtmp' [5.00 GiB] inherit
ACTIVE '/dev/vg/var' [700.00 GiB] inherit
ACTIVE '/dev/vg/snaps' [4.00 GiB] inherit
I just need to delete the /dev/vg/snaps LV, so that that 4GB is
available for my LVM snapshots.
Am I correct that all I have to do is:
# umount /dev/vg/snaps
# lvremove /dev/vg/snaps
Then remove this line from fstab?
This would then result in my VG having 4GB available for taking LVM
snapshots?
Would appreciate a confirmation that I don't have to do anything else to
totally eliminate the snaps LV...
I unmounted it, and commented that line in fstab. lvscan still shows the
same as above, but lvs shows the snaps with a slightly different attribute:
# lvs
LV VG Attr LSize
log vg -wi-ao---- 5.00g
snaps vg -wi-a----- 4.00g
tmp vg -wi-ao---- 5.00g
var vg -wi-ao---- 700.00g
vtmp vg -wi-ao---- 5.00g
So again - is lvremove /dev/vg/snaps the correct way - and the only
thing I need to do - to remove that LV as if it had never been created?
Yes. This page has a definition of the attributes:
http://man7.org/linux/man-pages/man8/lvs.8.html. "o" in position 6
means device open; since you've unmounted it, it is no longer open.
I learned via this mailing list that lvremove just updates metadata to
make the space available again, but doesn't remove the filesystem in the
LV. So if you were to recreate the exact same LV you just removed, the
filesystem would still be there. My situation was unusual, and you
probably won't encounter this. But if you want to avoid that minor
possibility, use "wipefs -a /dev/vg/snaps" before lvremove.
--
Guy Rouillier
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