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Why E-Series synchronous mirroring takes a long time to complete initial sync process?

Applies to

  • E-Series SANtricity OS 
  • Synchronous Remote Volume Mirroring Feature

Answer

To avoid impacting data access response time in critical environments and applications, by default, every synchronous mirror pair is created with a synchronization priority set to medium level. However, this will cause initial sync to be very long as it is directly mapped to "delay time" during the background initial data transfer when creating a new pair.

Changing the synchronization priority in SANtricity Storage Manager:
   Screen Shot 2019-05-01 at 16_16_13(1).png

Changing the synchronization priority in SANtricity System Manager (SAM):
Screen Shot 2019-05-01 at 16_21_11.png

Additional Information

The best practices and feature deployment guide can be found in TR-4656 on the field portal.