Scheduling an automatic disk scrub

About disk scrub scheduling

By default, automatic disk scrubbing is enabled for once a week and begins at 1:00 a.m. on Sunday. However, you can modify this schedule to suit your needs.

You can reschedule automatic disk scrubbing to take place on other days, at other times, or at multiple times during the week.
You might want to disable automatic disk scrubbing if disk scrubbing encounters a recurring problem.
You can specify the duration of a disk scrubbing operation.
You can start or stop a disk scrubbing operation manually.

Rescheduling disk scrubbing

If you want to reschedule the default weekly disk scrubbing time of 1:00 a.m. on Sunday, you can specify the day, time, and duration of one or more alternative disk scrubbings for the week.

To schedule weekly disk scrubbings, complete the following steps.

Step	Action
1	Enter the following command: *options raid.scrub.schedule duration{h\|m}@weekday@start_time* [,duration{h\|m}@weekday@start_time] ...** duration `{h\|m}` is the amount of time, in hours (`h`) or minutes (`m`) that you want to allot for this operation. Note If no duration is specified for a given scrub, the value specified in the `raid.scrub.duration` option is used. For details, see Setting the duration of automatic disk scrubbing. weekday is the day of the week (`sun`, `mon`, `tue`, `wed`, `thu`, `fri`, `sat`) when you want the operation to start. start_time is the hour of the day you want the scrub to start. Acceptable values are `0`-`23,` where `0` is midnight and `23` is 11 p.m. Example The following command schedules two weekly RAID scrubs. The first scrub is for four hours every Tuesday starting at 2 a.m. The second scrub is for eight hours every Saturday starting at 10 p.m. options raid.scrub.schedule 240m@tue@2,8h@sat@22
2	Verify your modification with the following command: options raid.scrub.schedule The duration, weekday, and start times for all your scheduled disk scrubs appear. Note If you want to restore the default automatic scrub schedule of Sunday at 1:00 a.m., reenter the command with an empty value string as follows: `options raid.scrub.schedule " "`.

Step

Action

Enter the following command:

options raid.scrub.schedule 
duration{h|m}@weekday@start_time 
[,duration{h|m}@weekday@start_time] ...

duration {h|m} is the amount of time, in hours (h) or minutes (m) that you want to allot for this operation.

Note
If no duration is specified for a given scrub, the value specified in the raid.scrub.duration option is used. For details, see Setting the duration of automatic disk scrubbing.

weekday is the day of the week (sun, mon, tue, wed, thu, fri, sat) when you want the operation to start.

start_time is the hour of the day you want the scrub to start. Acceptable values are 0-23, where 0 is midnight and 23 is 11 p.m.

Example

The following command schedules two weekly RAID scrubs. The first scrub is for four hours every Tuesday starting at 2 a.m. The second scrub is for eight hours every Saturday starting at 10 p.m.

options raid.scrub.schedule 240m@tue@2,8h@sat@22

Verify your modification with the following command:

options raid.scrub.schedule

The duration, weekday, and start times for all your scheduled disk scrubs appear.

Note
If you want to restore the default automatic scrub schedule of Sunday at 1:00 a.m., reenter the command with an empty value string as follows: options raid.scrub.schedule " ".

Toggling automatic disk scrubbing

To enable and disable automatic disk scrubbing for the storage system, complete the following step.

Step	Action
1	Enter the following command: options raid.scrub.enable off \| on Use `on` to enable automatic disk scrubbing. Use `off` to disable automatic disk scrubbing.

Setting the duration of automatic disk scrubbing

You can set the duration of automatic disk scrubbing. The default is to perform automatic disk scrubbing for six hours (360 minutes). If scrubbing does not finish in six hours, Data ONTAP records where it stops. The next time disk scrubbing automatically starts, scrubbing starts from the point where it stopped.

To set the duration of automatic disk scrubbing, complete the following step.

Step	Action
1	Enter the following command: options raid.scrub.duration duration duration is the length of time, in minutes, that automatic disk scrubbing runs. Note If you set duration to `-1`, all automatically started disk scrubs run to completion.

Note
If an automatic disk scrubbing is scheduled through the options raid.scrub.schedule command, the duration specified for the raid.scrub.duration option applies only if no duration was specified for disk scrubbing in the options raid.scrub.schedule command.

Changing disk scrub speed

To change the speed of disk scrubbing, see Controlling the speed of disk scrubbing.