The user is supposed to run it manually or via a periodic system service. The
recommended period is a month but could be less. The estimated device bandwidth
utilization is about 80% on an idle filesystem. The IO priority class is by
-default 'idle' so background scrub should not interfere with normal filesystem
-operation significantly.
+default 'idle' so background scrub should not significantly interfere with
+normal filesystem operation.
The scrubbing status is recorded in '/var/lib/btrfs/' in textual files named
-'scrub.status.UUID' for a filesystem identified by the given UUID. (An
-itermediate progress is communicated through a named pipe in file
-'scrub.progress.UUID' in the same directory.) The status file is updated
-periodically every 5 seconds. A resumed scrub will continue from the last
-saved position.
+'scrub.status.UUID' for a filesystem identified by the given UUID. (Progress
+state is communicated through a named pipe in file 'scrub.progress.UUID' in the
+same directory.) The status file is updated every 5 seconds. A resumed scrub
+will continue from the last saved position.
SUBCOMMAND
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