HP B-series Embedded Switches Manual do Utilizador descarregar pdf (Página 199)

Troubleshooting

199Fabric OS Procedures Version 3.1.x/4.1.x User Guide

Specific Scenarios

The following sections provide specific help with some of the most common SAN

problems.

Host Can Not See Target (Storage or Tape Devices)

When a host cannot “see” its disks, the best way to troubleshoot the problem is to

start in the middle half of the data path, figure out if the problem is “above” or

“below” the data path, and keep dividing the suspect path in half until the problem

is identified.

There are two areas to check in the process of elimination:

■ Check the Logical Connection

■ Check the Simple Name Server (SNS)

■ Check for Zoning Discrepancies

■ Check Device Communication

Check the Logical Connection

Check Whether the Device is Logically Connected to the Switch

1. Enter the switchShow command.

2. Review the output and determine if the device is logically connected to the

switch:

— A device that is logically connected to the switch will be registered as an

NX_Port.

— A device that is not logically connected to the switch will be registered as

something besides an NX_Port.

— If the missing device is logically connected, move on to Check for the

Device in the SNS.

— If the missing device is not logically connected, eliminate the host

and everything on that side of the data path from the suspect list.

This includes all aspects of the host’s OS, the HBA driver settings and

binaries, the HBA Basic Input Output System (BIOS) settings, the

HBA SFP, the cable going from the switch to the host, the SFP on the

switch side of that cable, and all switch settings related to the host.

Move on to Link Initialization Failure (Loop).

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HP B-series Embedded Switches Manual do Utilizador Página 199