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More info: Installing Slackware on Logical volumes
Create the partions with (c)fdisk as usual and toggle the partion that you want to dedicate to the LVM with the 43 flag. In the first disk (/dev/nvme0n1 for me) I have
Device Start End Sectors Size Type /dev/nvme0n1p1 2048 196607 194560 95M EFI System /dev/nvme0n1p2 16779264 37750783 20971520 10G Linux filesystem /dev/nvme0n1p3 37750784 879097855 841347072 401.2G Linux LVM /dev/nvme0n1p4 196608 16779263 16582656 7.9G Linux swap
p4 is the swap partition, p2 is the root / partition, while p3 is ready for the volume where I'll have to put my LXC virtual machines.
The secondi disk will be entirily dedicated to the LVM:
Device Start End Sectors Size Type /dev/nvme1n1p1 2048 879097855 879095808 419.2G Linux LVM
Create the volume with the /dev/nvme0n1p3 and /dev/nvme1n1p1 partions:
# pvcreate /dev/nvme0n1p3 /dev/nvme1n1p1 Physical volume "/dev/nvme0n1p3" successfully created. Physical volume "/dev/nvme1n1p1" successfully created.
Create a virtual group named my_vg (it will hold the /usr/local mount)
# vgcreate my_vg /dev/nvme0n1p3 /dev/nvme1n1p1 Volume group "my_vg" successfully created
Create the Logical Volume usrlocal and allocate all the available space:
lvcreate -l 100%FREE -n usrlocal my_vg
Create the filesystem
mkfs.ext4 /dev/my_vg/usrlocal
Mount the volume in /usr/local
mount /dev/my_vg/usrlocal /usr/local
Main LVM commands
Physical Volumes (PV)
| Command | Description | Example |
|---|---|---|
pvcreate /dev/sdx |
Initialize a physical device for LVM | pvcreate /dev/nvme0n1p3 |
pvs |
List all physical volumes | pvs |
pvdisplay /dev/sdx |
Show detailed info about a PV | pvdisplay /dev/nvme1n1p1 |
pvremove /dev/sdx |
Remove LVM label from a physical volume | pvremove /dev/nvme1n1p1 |
Volume Groups (VG)
| Command | Description | Example |
|---|---|---|
vgcreate my_vg /dev/sdx ... |
Create a volume group from PVs | vgcreate my_vg /dev/nvme0n1p3 /dev/nvme1n1p1 |
vgs |
List volume groups | vgs |
vgdisplay my_vg |
Show detailed info about a volume group | vgdisplay my_vg |
vgextend my_vg /dev/sdx |
Add a PV to an existing volume group | vgextend my_vg /dev/sdb1 |
vgreduce my_vg /dev/sdx |
Remove a PV from a volume group (must be empty) | vgreduce my_vg /dev/sdb1 |
vgremove my_vg |
Remove an empty volume group | vgremove my_vg |
Logical Volumes (LV)
| Command | Description | Example |
|---|---|---|
lvcreate -L size -n name my_vg |
Create an LV with fixed size | lvcreate -L 100G -n data my_vg |
lvcreate -l 100%FREE -n name my_vg |
Create an LV using all free space | lvcreate -l 100%FREE -n usrlocal my_vg |
lvs |
List logical volumes | lvs |
lvdisplay /dev/my_vg/name |
Show detailed info about an LV | lvdisplay /dev/my_vg/usrlocal |
lvremove /dev/my_vg/name |
Remove (delete) an LV | lvremove /dev/my_vg/usrlocal |
lvextend -L +size /dev/my_vg/name |
Increase LV size | lvextend -L +50G /dev/my_vg/usrlocal |
lvreduce -L -size /dev/my_vg/name |
Reduce LV size (use with care!) | lvreduce -L -10G /dev/my_vg/usrlocal |
Other Useful Commands
| Command | Description | Example |
|---|---|---|
lvchange -ay /dev/my_vg/name |
Activate an LV | lvchange -ay /dev/my_vg/usrlocal |
lvchange -an /dev/my_vg/name |
Deactivate an LV | lvchange -an /dev/my_vg/usrlocal |
pvmove /dev/sdx |
Move data from one PV to others in VG | pvmove /dev/nvme1n1p1 |
vgscan |
Scan all disks for VG headers | vgscan |
vgchange -ay my_vg |
Activate all LVs in a VG | vgchange -ay my_vg |
vgchange -an my_vg |
Deactivate all LVs in a VG | vgchange -an my_vg |
