LVM
Logical Volume Management on Linux
Link
- How do you clone an lvm partition?
- Monitoring with zabbix
- HOWTO
- Thin provisioning
- Beginner's guide to LVM
- Resizing LVM + DRBD
- http://wiki.tldp.org/LVM-on-RAID
- LVM nesting
- http://blog.gadi.cc/better-lvm-for-kvm/
- [https://www.tecmint.com/take-snapshot-of-logical-volume-and-restore-in-
- Taking a Backup Using Snapshots
NOTE: remember to add snapshot support when calling lvcreate
Related commands
lvdisplay
lsblk
partprobe
lvchange
vgchange
dmsetup
vgs
create physical volume
pvcreate /dev/sda3
lvcreate
lvcreate -L12G -nmyvol myvolumegroup lvcreate -l 100%FREE -nmyvol myvolumegroup
lvresize
lvresize --resizefs -L-2G /dev/vg/foo
or grow to all remaining space vg:
lvresize -l +100%FREE /dev/myvg/myvol
lvremove
To remove all volumes in group VGname
lvremove VGname
To remove a volume
lvremove VGname/LVname
pvck
To find the metadata:
pvck /dev/sdb1
LVM snapshot
lvcreate --size 1G --snapshot --name snap-1 /dev/myvg/mylv
where size should be enough to hold the data changes
FAQ
Access logical volumes within logical volume
partprobe /dev/mapper/vg-mydata lsblk
This will show the (sub) partitions/volumes, then edit /etc/lvm/lvm.conf
filter = [ "a|.*/|", "a|mydata|","r|.*|" ]
Then run:
vgscan lvscan vgs
Now you should see the names of the volumes you're looking for, so now:
vgchange -a y guestsname_mydata-home
and then you should be able to
mount /dev/mapper/guestsname_mydata-home
When done, remember to change back the filter in lvm.conf, default is
filter = [ "a|.*/|" ]
and of course then once again
vgscan lvscan
grow logical volume
https://www.tldp.org/HOWTO/LVM-HOWTO/extendlv.html
lvextend -L+100G /dev/myvg/myvol
Add disk to volume group
pvcreate /dev/sdc vgextend MYVG /dev/sdc
And if you need space right now:
lvextend -l +100%FREE /dev/NYVG/mylv
And then grow fs
lvremove: Logical volume vg-kvm/vps-snapshot is used by another device.
Could be kpartx, see
/dev/mapper/
lvremove Logical volume foo/bar in use
check with lsof, fuser and:
losetup -l
to see if a /dev/dm-* looks familiar
some say lvchange -an the snapshot first, but that disables the lv it's connected to as well
OR
dmsetup info -c
http://blog.roberthallam.org/2017/12/solved-logical-volume-is-used-by-another-device/comment-page-1/
Grow physical volume
Assuming your LVM partition is the last one, use fdisk to delete and recreate it, remember to set type to LVM again and reboot. Then use pvresize /dev/sdaX
Remove physical drive from a volume group
Make sure the data fits on remaining drive, then
pvmove /dev/sdbX vgreduce /dev/sdbX
Create volume group
vgcreate vgname /dev/sdc1 /dev/sdd1
Device /dev/sdb excluded by filter
Try:
wipefs -af /dev/sdb
