Scrubbing a storage pool verifies the content by checking for errors. If any unrecoverable errors are found, either through a scrub or through normal operation, the BUI displays the affected files.
In general, a scrub should be performed as often as your oldest backup expires, at a minimum. The recommended time frame for performing a scrub is quarterly. A scrub should also be run before performing a software upgrade.
The scrub status is displayed, including the date and time of the scrub, the number of errors, and the filenames with errors.
Clicking SCRUB again resumes the scrub from where it was stopped.