linuxexpert-practice-labs/labs/linux-plus/1-3-2-lvm

Linux+ 1.3.2: Logical volume management

A volume group with two logical volumes, growing one while it's mounted, and emptying a disk to take it out of the group.

Before you start

The lab adds two empty 1 GiB spare disks, /dev/loop40 and /dev/loop41 (the chapter's vdb and vdc). They come back at every boot. Nothing here is mounted at boot, so do the tasks in one go, without a reboot, and run le-lab check before you clean up.

Tasks

1. Make both disks physical volumes in a volume group vglab. Create a 600 MiB logical volume one and a logical volume two from all the rest of the space. Put ext4 on one and mount it at /mnt/one.
2. Remove two, and grow one and its filesystem by 300 MiB while it's mounted.
3. Move everything off /dev/loop40 and take it out of vglab.

When le-lab check passes, clean up as the chapter shows (unmount, remove the volume group and the physical volumes), or leave it to le-lab reset.

Hints

• pvcreate, vgcreate, lvcreate -n -L, lvcreate -l 100%FREE, mkfs.ext4; pvs, vgs, lvs.
• lvremove, lvextend -r -L +300M; df -h /mnt/one.
• pvs -o+pv_used, pvmove, vgreduce.