LVM

Physical Volumes

Usage

pvcreate Create a pv from disk pvcreate /dev/sda3

pvremove Remove a pv from a disk pvremove /dev/sda3

Move a pv to free extents (on

different pv) in the same vg pvmove -v /dev/sda3

pvmove

pvdisplay/pvs

Display info about pvs

pvscan Scan for pvs

pvresize Resize pvs to either a set size or

the size of the disk/partition

pvresize --setphysicalvolumesize 40G /dev/sda3

pvresize /dev/sda3

Volume Groups

Usage

vgcreate Create a vg from pvs. Characters

sets [] can be used for ranges vgcreate vgname /dev/sda3 /dev/sdb3

vgcreate vgname /dev/sd[d-m]1

vgremove Remove a vg vgremove vgname

vgdisplay/vgs

vgscan

Get info about vgs

Scan for vgs

vgextend Add a pv to a vg vgextend vgname /dev/sdb2

vgreduce Remove a pv from vg

Remove a missing pv from vg vgreduce vgname /dev/sdb2

vgreduce --removemissing

vgchange Change vg attributes like UUID or vgchange -u vgname

whether lvs in the vg are

vgchange -ay

accessible

vgchange -an

Logical Volumes

Usage

lvcreate Create an lv

Create an lv with stripe

Create an lv with mirror(s)

Create largest LV possible lvcreate --name lvname --size 50G vgname

lvcreate --name lvname -i3 -I4 --size 100G vgname

lvcreate --name lvname -m1 --size 50G vgname

lvcreate --name lvname -l +100%FREE vgname

lvremove Remove an lv lvremove /dev/vgname/lvname

lvdisplay/lvs

Display info about lvs

lvscan Scan for lvs

lvresize Resize an lv to a set size or a

percent of available space

lvresize --size 40G /dev/vgname/lvname

lvresize -l +100%FREE /dev/vgname/lvname

Misc

Path to Logical Volume

/dev/vgname/lvname

/dev/mapper/vgname-lvname

Logical Volumes Usage

Create a RAID0 LV lvcreate --name lvname --stripes 3 --stripesize 4 --size 100G

vgname

Create a RAID5 LV lvcreate --type raid5 --stripes 3 --size 1G --name lvname vgname

Create a RAID10 LV lvcreate --type raid10 --stripes 2 --mirrors 1 --size 10G --name

lvname vgname

Create an LV with mirror(s) lvcreate --name lvname --mirrors 1 --size 50G vgname

Split LV from mirror lvconvert --splitmirrors 2 --name copy /dev/vgname/lvname

Add tag to LV lvchange --addtag grouptag /dev/vgname/lvname

Volume Groups Usage

Splitting a Volume Group vgsplit vgname newvg /dev/sdb1

Combining Volume Groups vgmerge -v newvg oldvg

Move Volume Group to new host

vgchange -an vgname

vgexport vgname

Snapshots Usage

Create snapshot lvcreate --size 100G --snapshot --name snap /dev/vgname/lvname

Create thin-provisioned snapshot of lvcreate --shapshot --name thinsnap /dev/vgname/thinlvname

thin provisioned volume

Merge snapshot lvconvert --merge /dev/vgname/snap

Marge all snapshots with tag lvconvert --merge @grouptag

Cache Volumes Usage

Create cache data volume lvcreate -L 2G -n lv_cache VG /dev/sdf1

Create cache metadata volume lvcreate -L 12M -n lv_cache_meta VG /dev/sdf1

Create cache pool lvconvert --type cache-pool --cachemode writethrough

--poolmetadata VG/lv_cache_meta VG/lv_cache

Create cache logical volume lvconvert --type cache --cachepool VG/lv_cache VG/lv

Create thinpool on cached volume lvconvert --thinpool vg/cvol