Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

A production database server lost power unexpectedly. After it reboots you see the following kernel messages in the system console:

EXT4-fs error (device /dev/sdb1): ext4_lookup: deleted inode referenced: 184844
EXT4-fs (sdb1): Remounting filesystem read-only

The logical volume /dev/sdb1, which contains /var/lib, is now mounted read-only. SMART tests report no hardware problems.

Which action should you take first to correct the data-corruption issue and return the server to normal operation with minimal additional risk to the data?

  • Remount the partition with mount -o rw,discard /dev/sdb1 so that the ext4 journal can finish replaying.

  • Run smartctl -t long /dev/sdb1 and, if the disk passes, continue normal multi-user operation without further action.

  • Boot into single-user or rescue mode and run fsck.ext4 -f /dev/sdb1, allowing it to repair any inconsistencies it finds.

  • Overwrite the first 100 MB of the partition with dd if=/dev/zero of=/dev/sdb1 bs=1M count=100 and then recreate the filesystem.

CompTIA Linux+ XK0-006 (V8)
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