LVM on Ubuntu 16.04
LVM is the default volume manager in Ubuntu. It enables easy configurable logical virtual volumes on one or more physical hard drives.
It is already installed on Ubuntu 16.04 Server.
Configure at installation
The LVM should be configured within the installation setup, just e.g. follow the LVM guided partition agent for usage of LVM on the complete disk. When asked how much memory should be consumed, only use a part of the available storage, snapshots or backups could take a lot of storage too!
Listing of Existing
Show existing volume groups
Show existing volumes with their groups
A example output of
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root some-vg -wi-ao---- 69,39g swap_1 some-vg -wi-ao---- 7,91g
LSizethe size available for the volume
Data%how much of the possible data is saved, when the volume is a snapshot indicates how much of the snaptshots available data is written - according to some wiki the snapshot is only valid when not written completely
root is located at
/dev/some-vg/root, the other volumes are also there. Default is that
root contains the mount point
/ of Ubuntu.
Create a 50GB volume in a group
lvcreate -L 50G -n <volume> <group> lvcreate -L 50G -n some-lv some-vg
then create a file-system on the volume
mkfs.ext4 /dev/<group>/<volume> mkfs.ext4 /dev/some-vg/some-lv
Will reduce the size of the LV to 5GB
lvreduce --resizefs -L 5G /dev/<group>/<volume> lvreduce --resizefs -L 5G /dev/some-vg/some-lv
Create a snapshot
lvcreate --size 50G --snapshot --name <snapshot-name> /dev/<group>/<volume>
Merges the snapshot with the original, the original will be again the state of the snapshot
lvconvert --merge /dev/<group>/<volume>
Merges could be made with
/dev/some-vg/root, just reboot and then it will swap the snapshot with root.
Deletes the snapshot after merge! So don't forget to make a new one.
The merge could need some time to finish. The status can be seen with
The snapshot name is now in brackets and
origin is at
Data% shows how much data needs to be moved before finished.
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