Controlling the speed of mirror verification

What mirror verification is

You use mirror verification to ensure that the two plexes of a synchronous mirrored aggregate are identical. See the synchronous mirror volume management chapter in the Data Protection Online Backup and Recovery Guide for more information.

Changing mirror verification speed

To change the speed of mirror verification, complete the following step.

Step	Action
1	Enter the following command: options raid.verify.perf_impact impact impact can be `high`, `medium`, or `low` (default). High means that the storage system uses most of the available system resources for mirror verification; this setting can heavily affect storage system performance. Low means that the storage system uses very little of the system resources; this setting lightly affects storage system performance.

Step

Action

Enter the following command:

options raid.verify.perf_impact impact

impact can be high, medium, or low (default).

High means that the storage system uses most of the available system resources for mirror verification; this setting can heavily affect storage system performance.

Low means that the storage system uses very little of the system resources; this setting lightly affects storage system performance.

RAID operations affecting mirror verification speed

When mirror verification and disk scrubbing are running at the same time, Data ONTAP limits the combined resource utilization to the greatest impact set by either operation. For example, if raid.verify.perf_impact is set to medium and raid.scrub.perf_impact is set to low, the resource utilization of both operations has a medium impact.