Verifying host connectivity

Follow these procedures to resolve host connectivity issues.

Problem

These procedures apply to a situation where a host cannot connect to a storage unit.

Check that the host is correctly configured in the DS Storage Manager: Use the Host systems pages in the DS Storage Manager to ensure that your host systems are configured correctly.
Check that the storage unit, SAN switches, and hosts are powered on.: The server enclosure, the connected expansion enclosures, any SAN switch devices, and the attached host must be powered on before you can send information between the host and the storage unit.
Check that the SAN fabric configuration is correct: Unless directly attached, you must configure the SAN fabric correctly so that the zoning allows for communication between the host system and the storage unit.
Check that the cabling is correct between the hosts and the storage unit.: Miscabling between the storage unit and the host system can cause communication problems.
Check that the fiber optic cables and SFPs are operational.: Sequentially replace individual cables and small-form factor pluggables (SFPs) to determine if there are any cable problems.
If, after you complete all of the steps above, the storage unit still cannot communicate with the host system, call IBM Support.: IBM Support personnel can determine the cause of the problem and find a resolution that will reenable host communication.