HP StorageWorks MSA 2/8 HP StorageWorks Fabric OS Procedures V3.1.x/4.1.x User - Page 194
About Troubleshooting, the storage device is logically connected to the switch. If
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Troubleshooting About Troubleshooting Troubleshooting should begin at the center of the SAN - the fabric. Because switches are located between the hosts and storage devices, and have visibility into both sides of the storage network; starting with them can help narrow the search path. After eliminating the possibility of a fault within the fabric, see if the problem is on the storage side or the host side, and continue a more detailed diagnosis from there. Using this approach can quickly pinpoint and isolate problems. For example, if a host cannot see a storage device, run a switch command to see if the storage device is logically connected to the switch. If not, focus first on the storage side. Use storage diagnostic tools to better understand why it is not visible to the switch. Once the storage can be seen from the switch, if the host still cannot see the storage device, then there is still a problem between the host and the switch. 194 Fabric OS Procedures Version 3.1.x/4.1.x User Guide