Stockage Cloud LVM

pvs - pvdisplay
vgs - vgdisplay
lvs - lvdisplay

# create physical volumes
pvcreate /dev/sda1 /dev/sdb1 /dev/sdc1

# volume group
vgcreate vg1 /dev/sda1 /dev/sdb1
# create logical volume
lvcreate -L 30G -n lv1 vg1 # stripé -i? (? number of stripes), mirroré -m? (? number of mirrors, ex: -m1 creates LV with one mirror "RAID1 avec 2 devices" )

# using physical extents (1 PE = 4MB)
lvcreate -l 400 -n lv1 vg1
# percentage
lvcreate -l 60%VG -n lv1 vg1

# thin pool
lvcreate -L 20G -T vg1/thinPool
# ou bien
lvcreate -L 20G --thinpool thinPool vg1

# thin volume
lvcreate -V 40G -T vg1/thinPool -n thinVolume
# create thin pool and thin volume in one command
lvcreate -L 20G -T vg1/thinPool -V 40G -n thinVolume

# remove logical volume
lvremove /dev/vg1/lv1

# extend volume group
vgextend vg1 /dev/sdc1
# extend thin pool
lvextend -l 100%FREE vg1/thinPool
# extend logical volume
lvextend -L +2G vg1/lv1
resize2fs /dev/vg1/lv1
# ou bien
lvextend -L +2G vg1/lv1 -r # "-r" resize the file system == resize2fs

# reduce volume group
vgreduce vg1 /dev/sdb1
# reduce logical volume
lvreduce -L -2G vg1/lv1 -r

# convert logical volume to thin pool
lvconvert --thinpool vg1/lv1
# convert simple (linear) logical volume to a mirrored logical volume
lvconvert -m? vg1/lv1 # (? enter number)
# convert a 1 mirrored logical volume to a linear logical volume
lvconvert -m0 vg1/lv1

# create snapshot volume of a logical volume (lv1 backup)
lvcreate -L 4G -s vg1/lv1 -n snapshotVolume

# -- insert modifications on lv1 --

# restore snapshot (lv1 restore)
lvconvert --merge /dev/vg1/snapshotVolume # -- changes will be made on next reboot if the volume is mounted/in use --

# remove snapshot
lvremove /dev/vg1/snapshotVolume


# LVMs auto extend
vim /etc/lvm/lvm.conf
# thin_pool_autoextend_threshold, thin_pool_autoextend_percent
# snapshot_autoextend_threshold, snapshot_autoextend_percent