linuxexpert-practice-labs/labs/rhcsa/6-4-extending-logical-volumes/README.md

RHCSA 6.4: Extending logical volumes

Growing a mounted XFS volume, growing a volume and its file system in two steps, and adding a disk to a full volume group.

Before you start

The lab adds two spare disks, /dev/loop40 (2 GiB) and /dev/loop41 (1 GiB, empty). They come back at every boot, before file systems are mounted. On /dev/loop40 it creates volume group vg_lab with two logical volumes, both mounted at every boot (lines in /etc/fstab):

• lv_data, 500 MiB, XFS, at /data;
• lv_logs, 300 MiB, ext4, at /logs.

Each holds a file keep.txt that must survive.

Tasks

1. Grow lv_data and its file system by 200 MiB without unmounting it.
2. Grow lv_logs by 100 MiB without -r, and see what df -h /logs says. Then grow the file system to match.
3. Grow lv_data to fill all of vg_lab's free space. Then grow it by another 200 MiB by adding /dev/loop41 (or a partition on it) to vg_lab.

Hints

• lvextend -r -L +200M; lvs, df -h.
• lvextend -L +100M, then resize2fs (ext4) or xfs_growfs (XFS).
• lvextend -l +100%FREE; vgs shows VFree. pvcreate (or a partition with fdisk or parted), vgextend; pvs.