LVM
Posted on So 28 August 2011 in Notebook
shrink lvm
# Unmount the filesystem and check its' LV umount /mnt/foo e2fsck -f /dev/mapper/vg0-foo # Shrink ext4 and then the LV to the desired size resize2fs -p /dev/mapper/vg0-foo 40G lvreduce -L 40G /dev/mapper/vg0-foo # Before continuing, run e2fsck. If it bails because the partition # is too small, don't panic! The LV can still be extended with # lvextend until e2fsck succeeds, e.g.: # lvextend -L +1G /dev/mapper/vg0-foo e2fsck -f /dev/mapper/vg0-foo # Resize the filesystem to match the LVs size, check and mount it resize2fs -p /dev/mapper/vg0-foo e2fsck -f /dev/mapper/vg0-foo mount /mnt/foo
expand lvm
umount /mnt/bar # Extend the LV to use all free space lvextend -l +100%FREE /dev/mapper/vg0-bar e2fsck -f /dev/mapper/vg0-bar # Resize the partition to fill the LV resize2fs -p /dev/mapper/vg0-bar e2fsck -f /dev/mapper/vg0-bar mount /mnt/bar
expand luks encrypted filesystems
umount /crypto e2fsck -f /dev/mapper/crypto cryptsetup luksClose crypto lvextend -L +100M /dev/cryptovg/crypto cryptsetup luksOpen /dev/cryptovg/crypto crypto cryptsetup -v resize crypto e2fsck -f /dev/mapper/crypto resize2fs /dev/mapper/crypto e2fsck -f /dev/mapper/crypto mount /dev/mapper/crypto /crypto
Snapshot
Taking A Snapshot
sudo lvcreate --size 1G -s -n snapshot_lv /dev/vgroup/original_lv
Mounting A Snapshot
sudo mkdir /mnt/snap sudo mount /dev/ubuntu/mysnap /mnt/snap cd /mnt/snap
Reverting/Merging To The Snapshot's State
lvconvert --merge /dev/vgroup/snapshot-lv
Removing A Snapshot
sudo lvremove /dev/vgroup/snapshot_lv_name