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

The maximum number of active, concurrent virtual disk processes per RAID controller module installed in the storage array is four. This limit is applied to the following virtual disk processes:

• Background initialization
• Foreground initialization
• Consistency check
• Rebuild
• Copy back

If a redundant RAID controller module fails with existing virtual disk processes, the processes on the failed controller are transferred to the peer controller. A transferred process is placed in a suspended state if there are four active processes on the peer controller. The suspended processes are resumed on the peer controller when the number of active processes falls below four.