RHCSA RHCSA LVM Storage Management 3

Question 1

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

Accepted Answer

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

Answer

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

Question 2

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

Accepted Answer

That the LV is a snapshot

Answer

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

Question 3

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

Accepted Answer

vgreduce vg0 /dev/sdb

Answer

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

Question 4

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

Accepted Answer

pvmove /dev/sdb1

Answer

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

Question 5

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

Accepted Answer

4 MB

Answer

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

RHCSA Exam Practice Test