LVM

LVM Components:

Create in this order:

• physical volumes
• volume groups
• logical volumes

Physical Volumes:

• pvcreate <device>
• pvscan -v

Volume Groups:

•  vgcreate <volume_group_name> <physical_volume1><physical_volume2> ...
• pvscan -v

Additional volume group commands:

• vgexpand: add additional physical volumes to volume group
• vgreduce: remove physical volume. Run pvmove first to move data to another physical volume
• vgremove: delete volume group first, remove all logical volumes

Creating Logical Volumes:

•  lvcreate -L <volume_size> -n <volume_name> <volume_group_name>
• -->lvcreate -L 7G -n research Data

Additional logical volume management commands:

• lvextend: increase size of logical volume. you must first add additional physical volume(s)
• lvreduce: reduce size of logical volume
• lvremove: remove logical volume. Use caution when using lvremove, you could chop off data