When TrueNAS performs a scrub, ZFS scans the data on a pool. Scrubs identify data integrity problems, detect silent data corruptions caused by transient hardware issues, and provide early disk failure alerts.

TrueNAS generates a default scrub task when you create a new pool and sets it to run every Sunday at 12:00 AM.

The Data Protection screen Scrub Task widget displays a list of scrub tasks configured on the system. Scrubs identify data integrity problems, detect silent data corruptions caused by transient hardware issues, and provide early disk failure alerts. TrueNAS generates a default scrub task when you create a new pool and sets it to run every Sunday at 12:00 AM.

Add opens the Add Scrub Task screen.