Plex resynchronization refers to the process of synchronizing the data of the two plexes of a mirrored aggregate. When plexes are unsynchronized, one plex contains data that is more up to date than that of the other plex. Plex resynchronization updates the out-of-date plex so that both plexes are identical.
Considerations
Data ONTAP resynchronizes the two plexes of a mirrored aggregate if one of the following situations occurs:
- One of the plexes was taken offline and then brought online later.
- You add a plex to an unmirrored aggregate.
When plex resynchronization and RAID data reconstruction 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.resync.perf_impact is set to medium and raid.reconstruct.perf_impact is set to low, the resource utilization by both operations has a medium impact.
Step
-
Enter the following command: options raid.resync.perf_impact impact
impact can be high, medium, or low.
high means that the storage system uses most of the system resources available for plex resynchronization; this setting can heavily affect storage system performance, but the resynchronization finishes sooner.
low means that the storage system uses very little of the system resources; this setting lightly affects storage system performance, but the resynchronization will take longer to finish.
The default impact is medium.
