PowerEdge: RAID 10 Mirror Set ID for PowerEdge RAID Controller 9 and later series

From PERC 9 and later series of controllers, we no longer have multiple spans when implementing RAID 10 arrays. The technology has changed to a Single Span implementation. The main reasons for this are:

• Fully use SSD capabilities for maximum performance.
• Allow the span to expand beyond 32 physical disks.

Link to KB article 131648 showing PERC families: List of PowerEdge RAID Controller (PERC) types for Dell EMC systems.

Terminology to correlate the drives that are mirrored to each other has changed. Instead of "spans" they are known as "Mirror Sets." We can see the Mirror Set ID using OpenManage Server Administrator and OpenManage Command Line.
 

Finding the Mirror Set ID during RAID creation.

During creation of the RAID 10 in OpenManage Server Administrator, OMSA shows the Mirror Set ID for each hard drive during creation. The drives are paired in order. The first two drives are part of the first Mirror Set 0, the next two drives are Mirror Set 1, and so on.

Finding the Mirror Set ID of an already created RAID 10.

After creation of a RAID 10 array, the Mirror Set ID is seen by expanding the individual physical disk properties in the Physical Disk list.
 

Finding the Mirror Set ID using OMCLI.

Using OMCLI, you can find the Mirror Set ID when outputting physical disk properties.
Example Command: omreport storage pdisk controller=0

This outputs properties for all disks.
 

Refer to this video: