Linux Advanced File System and Storage 2

Question 1

Which command displays the UUID of all block devices on a Linux system?

Accepted Answer

blkid

Answer

blkid queries and displays attributes of block devices including their UUIDs, filesystem types, and labels.

Question 2

In LVM, what is a Physical Extent (PE)?

Accepted Answer

The smallest allocatable unit in a Physical Volume

Answer

A Physical Extent is the smallest unit of disk space that can be allocated in LVM, typically 4MB by default.

Question 3

Which ext4 feature reduces fragmentation by pre-allocating contiguous blocks for growing files?

Accepted Answer

Delayed allocation

Answer

Delayed allocation (also called allocate-on-flush) holds off block assignment until data is actually written, allowing the kernel to allocate contiguous blocks and reduce fragmentation.

Question 4

What does the 'noatime' mount option do?

Accepted Answer

Prevents updating file access timestamps on reads

Answer

noatime prevents the kernel from updating the atime (access time) inode field on every file read, significantly reducing disk writes.

Question 5

Which RAID level requires a minimum of 4 disks and provides both striping and dual-parity?

Accepted Answer

RAID 6

Answer

RAID 6 uses dual distributed parity, can survive two simultaneous disk failures, and requires a minimum of 4 disks.

Linux Practice Test

Linux Practice Test

Linux Advanced File System and Storage 2