Lenovo ThinkSystem DM3000 series Hardware Installation And Maintenance Manual page 62

Recabling the system
After running diagnostics, you must recable the controller module's storage and network connections.
Step 1. Recable the system.
Step 2. Verify that the cabling is correct.
Reassigning disks
If the storage system is in an HA pair, the system ID of the new controller module is automatically assigned to
the disks when the giveback occurs at the end of the procedure.
You must use the correct procedure for your configuration:
Controller redundancy
HA pair
56
ThinkSystem DM3000x and DM5000x Hardware Installation and Maintenance Guide
Then use this procedure...
"Verifying the system ID change on an HA system" on
page 57.