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→Rename Logigal Volume
https://www.howtoforge.com/linux_lvm
https://www.howtoforge.com/linux_lvm
= Creating LVMs =
=Creating LVMs=
* Partition disks as Linux LVM with fdisk
* Prepare new partitions for LVM Example:
*Partition disks as Linux LVM with fdisk
*Prepare new partitions for LVM Example:
pvcreate /dev/sdb1 /dev/sdc1 /dev/sde1 # pvremove /dev/sdb1 /dev/sdc1 /dev/sde1 to revert
pvcreate /dev/sdb1 /dev/sdc1 /dev/sde1 # pvremove /dev/sdb1 /dev/sdc1 /dev/sde1 to revert
pvdisplay # to show Physycal volumenes
pvdisplay # to show Physycal volumenes
* Create a volume group example 'pilaf':
vgcreate pilaf /dev/sdg1 /dev/sdf1
*Create a volume group example 'pilaf':
vgcreate pilaf /dev/sdg1 /dev/sdf1 # vgremove pilaf to delete
*Check existing Volume Groups
vgdisplay
vgscan
*Create logical volumes in volume group
lvcreate --name pilaf_copy --size 4T pilaf
lvcreate --name pilaf_converter --size 4T pilaf
*Check existing logical volumes with:
lvdisplay / lvscan
*Rename logical volumes with
lvrename {volume_group} {old_name} {new_name} | example: lvrename pilaf pilaf_copy pilaf_raw
*Enlarge/reduce Logical volume with:
lvextend -L4.5T /dev/pilaf/pilaf_raw
lvreduce -L4T /dev/pilaf/pilaf_raw
*Create the filesystems
mkfs.ext4 /dev/pilaf/pilaf_raw
mkfs.ext4 /dev/pilaf/pilaf_converter
*Add /etc/fstab entries
/dev/pilaf/pilaf_raw /Pilaf ext4 rw,noatime 0 0
/dev/pilaf/pilaf_converter /PilafConverter ext4 rw,noatime 0 0
=Resize LVM Logical Volumes & Filesystems=
==Enlarge==
*Unmount the Logical Volume
/umount /PilafConverter
*Extend the Logical Volume
lvextend -L 4.5T /dev/pilaf/pilaf_converter
*Extend the filesystem
e2fsck -f /dev/pilaf/pilaf_converter
resize2fs /dev/pilaf/pilaf_converter
*Mount again
mount /dev/pilaf/pilaf_converter /PilafConverter
==Shrink==
*Unmount the Logical Volume
/umount /PilafConverter
*Shrink (Requires a number of blocks)
e2fsck -f /dev/pilaf/pilaf_converter # to figure out the blocks we want to keep
resize2fs /dev/pilaf/pilaf_converter 104857600
lvreduce -L40G /dev/pilaf/pilaf_converter
*Mount again
mount /dev/pilaf/pilaf_converter /PilafConverter
=Add/Remove Hard Drives=
==Add==
*Format the new HD with fdisk (Linux LVM)
fdisk /dev/sdX (n (new)--> p (primary)--> 1 (default sdX1)--> t --> Linux LVM (8e|30) --> w)
*Prepare
pvcreate /dev/sdX1
*Extend Volume Group
vgextend fileserver /dev/sdX1
*Check
vgdisplay
==Remove==
*Move data to some other disk
pvmove /dev/sdb1 /dev/sdf1
*Remove disk from Volume Group
vgreduce fileserver /dev/sdb1
vgdisplay
*Remove Phisical Volume
pvremove /dev/sdb1
pvdisplay
==LVM Backup==
https://www.howtoforge.com/linux_lvm_snapshots
== Activate inactive Logical Group ==
<syntaxhighlight lang="bash">
vgchange -a y
</syntaxhighlight>
=Rename Logigal Volume=
lvrename /dev/vg02/lvold /dev/vg02/lvnew
lvrename vg02 lvold lvnew