Her stomach dropped. Without -n , the repair would have just crashed, potentially leaving the filesystem in an unmountable, shredded state. She needed the nuclear option.
Phase 4 completed. Phase 5. Finally, the line she needed: xfs-repair centos 7
xfs_repair -L /dev/sdb1 The -L flag is XFS’s last resort. It zeroes out the log, discarding all pending transactions. It’s dangerous—like performing surgery with a fire axe. You lose any operations that hadn’t been written to disk. But without it, the log was a poison pill preventing any repair. Her stomach dropped