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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

Storage array performance during virtual disk copy

The following factors contribute to the overall performance of the storage array:
  • I/O activity
  • Virtual disk RAID level
  • Virtual disk configuration — Number of physical disks in the virtual disk groups
  • Virtual disk type — Snapshot virtual disks may take more time to copy than standard virtual disks
  • Snapshots created using older RAID controller firmware versions (legacy snapshots) will take longer to complete

During a virtual disk copy, resources for the storage array are diverted from processing I/O activity to completing a virtual disk copy. This affects the overall performance of the storage array. When you create a new virtual disk copy, you define the copy priority to determine how much RAID processing time is diverted from I/O activity to a virtual disk copy operation.


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