LPIC-2 Exam 201 (Linux Engineer) — Question 33

Which single command simulates a failed device within a RAID 5 array?

Answer options

• A. mdadm --remove /dev/md0 /dev/sdd1
• B. mdadm --zero-superblock /dev/sdf3
• C. mdadm --force-fault /dev/md2 /dev/sde2
• D. mdadm --fail /dev/md0 /dev/sdc1
• E. mdadm /dev/md0 --offline /dev/sdc1

Correct answer: D

Explanation

The correct command to simulate a failed device in a RAID 5 array is 'mdadm --fail /dev/md0 /dev/sdc1', as it specifically marks the device as failed. The other options either remove the device, zero the superblock, or mark the device as offline, but they do not simulate a failure in the same manner.