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The host fiber cable has connected to the controller expansion interface causes the host can’t identify the RAID group

Publication Date:  2012-12-12 Views:  151 Downloads:  0

Issue Description

There is a set of IBM DS4700 storage (its model is the same with the SceanStor S3100) which has allocated 16 disks, it has connected with the HP host, the DS4700 has distributed the RAID group, but in the HP host, we can just see the 16 independent disks but not see the distributed RAID group.

Alarm Information


Handling Process

Draw out the fiber cable from the controller expansion interface, and draw it in the controller’s host interface, the failure has disappeared and the host can identify the RAID group.

Root Cause

The fiber cable leading from the host HBA card should connect at the host interface of the storage controller, it shouldn’t connect at the expansion interface, if it has connected at the expansion interface, the host won’t identify the RAID group but just the independent disk.