RAID

Question 1

What does RAID stand for?

Answer 1

Redundant Array of Independent Disks

Question 2

What is the purpose of RAID?

Answer 2

Combines multiple physical drives into logical units to enhance performance, redundancy, or both

Question 3

What does RAID 0 use for speed?

Answer 3

Striping

Question 4

What does RAID 1 use for protection?

Answer 4

Mirroring

Question 5

What do RAID 5 and RAID 6 use for error detection and recovery?

Answer 5

Parity

Question 6

What is the primary Linux tool for managing RAID arrays?

Answer 6

mdadm

Question 7

What does –create option in mdadm do?

Answer 7

Initializes a new RAID array

Question 8

What does –manage option in mdadm do?

Answer 8

Adds or removes disks from an existing array

Question 9

What does –monitor option in mdadm do?

Answer 9

Continuously watches array for failures

Question 10

What does –verbose option in mdadm do?

Answer 10

Provides detailed output

Question 11

Command to create a RAID 1 array with two devices?

Answer 11

sudo mdadm –create –verbose /dev/md0 –level=1 –raid-devices=2 /dev/sdb /dev/sdc

Question 12

How do you save RAID configuration?

Answer 12

sudo mdadm –detail –scan»_space; /etc/mdadm/mdadm.conf and sudo update-initramfs -u

Question 13

How do you format and mount the RAID array?

Answer 13

sudo mkfs.ext4 /dev/md0, sudo mkdir /mnt/raid, sudo mount /dev/md0 /mnt/raid

Question 14

What file enables automatic mounting at boot?

Answer 14

/etc/fstab

Question 15

How do you monitor RAID status?

Answer 15

sudo mdadm –monitor –verbose /dev/md0

Question 16

What file shows real-time RAID status?

Answer 16

/proc/mdstat

Question 17

What does [UU] indicate in /proc/mdstat?

Answer 17

Both disks are healthy

Question 18

What does [U_] indicate in /proc/mdstat?

Answer 18

A failed disk