Difference between revisions of "LVM"

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==lvcreate==
==lvcreate==
lvcreate -L12G -nmyvol myvolumegroup


==lvresize==  
==lvresize==  

Revision as of 23:31, 27 January 2018

Logical Volume Management on Linux

Link

NOTE: remember to add snapshot support when calling lvcreate

Related commands

lvdisplay

lsblk

partprobe

lvchange

vgchange

dmsetup

vgs

lvcreate

lvcreate -L12G -nmyvol myvolumegroup

lvresize

lvresize --resizefs -L-2G /dev/vg/foo

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


lvremove: Logical volume vg-kvm/vps-snapshot is used by another device.

???

some say lvchange -an the snapshot first, but that disables the lv it's connected to as well

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