On Mon, Jan 6, 2014 at 5:40 PM, Guy Rouillier <guy.rouillier@gmail.com> wrote: > 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. > Going a bit on a tangent, thanks for the info. I need to add that to my notes because sometimes when I want a lv to go away, I really really want it to go > -- > Guy Rouillier > > --- > This email is free from viruses and malware because avast! Antivirus > protection is active. > http://www.avast.com > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
