LFCS Certification Storage Management with LVM 5

Question 1

Which option to 'lvcreate' allocates extents using a contiguous allocation policy?

Accepted Answer

--alloc contiguous

Answer

The 'contiguous' allocation policy forces all extents of the LV to be physically adjacent on a single PV.

Question 2

What is the effect of running 'lvchange --permission r /dev/vg0/lv_data'?

Accepted Answer

Makes the LV read-only

Answer

lvchange --permission r sets the logical volume to read-only mode; 'rw' would restore read-write access.

Question 3

Which command reports the logical volume path, size, and current state in a script-friendly one-line-per-LV format?

Accepted Answer

lvs

Answer

lvs produces a compact, column-oriented report of all LVs suitable for scripting, unlike the verbose lvdisplay format.

Question 4

When using LVM cache (lvmcache), what is the role of the 'cache pool'?

Accepted Answer

Acts as a fast-tier device (SSD) that caches frequently accessed blocks of a slow origin LV

Answer

An LVM cache pool resides on fast storage (e.g., SSD) and transparently caches hot blocks from a slower origin logical volume.

Question 5

A volume group vg0 has PVs on /dev/sdb and /dev/sdc. Which command moves all extents from /dev/sdc to /dev/sdb before removing /dev/sdc?

Accepted Answer

pvmove /dev/sdc /dev/sdb

Answer

pvmove accepts an optional destination PV; specifying /dev/sdb forces all migrated extents onto that device.

LFCS Certification Practice Test