Verifying interenclosure connectivity

Follow theses procedures to resolve interenclosure connectivity issues.

Problem

Follow these procedures if you receive error messages or log entries that state that the DS Storage Manager cannot recognize drives, arrays, or volumes that are located in an attached server or expansion enclosure. You can also use these procedures if you receive an error message or log entry that the DS Storage Manager cannot recognize a connected expansion enclosure. These procedures apply to both new volumes or enclosures that have been added as well as existing volumes or enclosures that are no longer recognized by the DS Storage Manager.

Investigation

Check interenclosure cabling: Check the cabling between the server enclosure and the expansion enclosure that contains the unrecognized storage. Verify that the cabling between the enclosures matches the cabling that is provided in the appropriate cabling diagram.
Check that all of the cables are operational: If a cable develops a fault, you will receive an error entry or message stating that the connection to that expansion enclosure has been lost. Replace the specified cable, small-form factor pluggable (SFP), or both, to regain connectivity to the expansion enclosure.
If, after you complete all of the steps above, storage resources are still not recognized by the DS Storage Manager, call IBM Support.: IBM Support personnel can determine the cause of the problem and find a resolution that will regain connectivity to the storage.