LCA File Systems & Storage Management 2

Question 1

Which command displays the UUID of a block device?

Accepted Answer

blkid

Answer

blkid queries block device attributes including UUID, filesystem type, and label.

Question 2

What does the 'noatime' mount option do?

Accepted Answer

Disables access time updates on reads

Answer

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

Question 3

Which LVM command extends a logical volume AND resizes its ext4 filesystem in one step?

Accepted Answer

lvextend -r -L +10G /dev/vg0/lv0

Answer

lvextend -r (--resizefs) calls resize2fs automatically after extending the LV.

Question 4

In /etc/fstab, what does the fifth field (fs_freq) control?

Accepted Answer

Whether dump backs up the filesystem

Answer

The fifth field is used by the dump utility to determine which filesystems need to be backed up.

Question 5

Which RAID level provides striping with double distributed parity, tolerating up to two simultaneous disk failures?

Accepted Answer

RAID 6

Answer

RAID 6 uses two independent parity blocks distributed across all drives, surviving two disk failures.

(LCA) Certified Linux Administrator Practice Test