Lab 15.2: Grow and shrink logical volumes

Goal

Add a disk to a full volume group, grow an XFS and an ext4 volume while they are in use, shrink the ext4 volume, and take one disk out of the VG.

Finish lab 15.1. Add a second empty disk of 5 GiB (here /dev/vdd). Work as root.

Add the whole disk /dev/vdd to the volume group vgfiles.
Grow lvfiles by 1 GiB while it stays mounted. df -h /files must show the new size.
Grow lvdocs to a total size of 5 GiB, also while mounted.
Shrink lvdocs to 3 GiB without losing its files.
Move all data away from /dev/vdd and remove the disk from the VG (if the VG has enough free space; if not, shrink first or skip this task and explain why).

#vgs vgfiles; pvs
#lvs vgfiles
#df -h /files /docs

Show the hints

Show the solution

Extend the VG.

#pvcreate /dev/vdd
#vgextend vgfiles /dev/vdd

Grow lvfiles with its XFS.

#lvextend -r -L +1G /dev/vgfiles/lvfiles
#df -h /files

Shrink lvdocs (ext4) to 3 GiB.

#cp -a /etc/hosts /docs/test.txt
#lvreduce -r -L 3G /dev/vgfiles/lvdocs
#cat /docs/test.txt

Free /dev/vdd.

#pvmove /dev/vdd
#vgreduce vgfiles /dev/vdd
#pvremove /dev/vdd