Skip to main content
NetApp Knowledge Base

What is the difference between SnapMirror 'normal' and 'low' priority?

  1. Last updated
  2. Save as PDF
Views:
944
Visibility:
Public
Votes:
0
Category:
snapmirror
Specialty:
dp
Last Updated:

Applies to

ONTAP 9

Answer

  • SnapMirror normal and low priority are not related to SnapMirror throughput
  • The SnapMirror normal and low priority settings are related to SnapMirror job execution order, pending operations, and job queuing
  • SnapMirror priority is not 'priority,' as in CPU priority
  • SnapMirror priority has no effect on individual jobs when no other jobs are running
  • SnapMirror priority has the most significant effect when there are enough simultaneous jobs to fill up the queue
  • When there are enough simultaneous SnapMirror jobs to fill the queue, it can result in pending jobs
  • Jobs with normal priority will run before jobs with low priority
  • Jobs with low priority will not be run until all of the queued normal priority jobs have run
  • In a scenario where a normal and a low priority job are scheduled to run at the same time, the normal priority job will run first

Additional Information

Note: There is a known issue where active SnapMirror transfers will report running at 'low' priority even though the relationship's SnapMirror policy is configured to run at 'normal' priority. The SnapMirrors in this scenario are actually running at 'normal' priority.

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.