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.
Default Scrub Tasks TrueNAS generates a default scrub task when you create a new pool and sets it to run every Sunday at 12:00 AM.
Adjusting Scrub/Resilver Priority Resilvering is a process that copies data to a replacement disk.
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.
Each task is a link that opens the Edit Scrub Task Screen.
The SCALE CLI guide is a work in progress! New namespace and command documentation is continually added and maintained, so check back here often to see what is new!
Resilver Priority
Setting Description Enabled Select to run resilver tasks between the configured times. Begin Select the hour and minute when a resilver task can start from the dropdown list. The resilver process can run at a higher priority. End Select the hour and minute when new resilver tasks are not allowed to start. This does not affect active resilver tasks. The resilver process returns to running at a lower priority.
Resilvering is a process that copies data to a replacement disk. Complete it as quickly as possible. Resilvering is a high priority task. It can run in the background while performing other system functions, however, this can put a higher demand on system resources. Increasing the priority of resilvers helps them finish faster as the system runs tasks with higher priority ranking.
Use the Resilver Priority screen to schedule a time where a resilver task can become a higher priority for the system and when the additional I/O or CPU use does not affect normal usage.
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