RHCSA LVM Storage Management Flashcards

A volume group 'vg0' is full. You add a new disk /dev/sdc. What is the correct sequence to add it to vg0?

Answer: pvcreate /dev/sdc, then vgextend vg0 /dev/sdc

You must first initialize the disk as a PV with pvcreate, then extend the VG with vgextend.

What does the '-s' option specify when running lvcreate for a snapshot?

Answer: That the LV is a snapshot

lvcreate -s (--snapshot) creates a snapshot logical volume of an existing LV.

Which command reduces the size of volume group vg0 by removing physical volume /dev/sdb?

Answer: vgreduce vg0 /dev/sdb

vgreduce removes a physical volume from a volume group, provided the PV has no allocated extents.

You need to move all data off /dev/sdb1 (which is in vg0) to other PVs before removal. Which command does this?

Answer: pvmove /dev/sdb1

pvmove relocates all logical extents from the specified physical volume to other PVs in the same VG.

What is the default unit for extent size when creating a volume group with vgcreate?

Answer: 4 MB

The default physical extent size in LVM is 4 MB, though it can be changed with the -s option.

Which command merges a snapshot back into its origin logical volume?

Answer: lvconvert --merge

lvconvert --merge rolls back the origin LV to the state captured in the snapshot.

How do you rename a logical volume from 'old_lv' to 'new_lv' within volume group vg0?

Answer: lvrename vg0 old_lv new_lv

lvrename takes the VG name followed by the old and new LV names to rename the logical volume.