HP Brocade 4Gb SAN Switch for HP BladeSystem p-Class - Manual (Page 184)

184 Troubleshooting
3. Storage information:
• Disk/tape type
• Disk/tape firmware level
• Controller type
• Controller firmware level
• Configuration settings
• Storage software (such as EMC Control Center, Veritas SPC, etc.)
Analyzing connection problems
If a host is unable to detect its target (for example, a storage or tape device), you should begin
troubleshooting the problem in the middle of the data path. Determine if the problem is above or below
the starting point, then continue to divide the suspected problem path in half until you can pinpoint the
problem.
Use the following procedures to analyze the problem:
To check the logical connection:
1. Issue 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 is registered as an Nx_Port.
• A device that is not logically connected to the switch is registered as something other than an
Nx_Port.
3. If the missing device is logically connected, proceed to the next troubleshooting procedure (” To check
the Simple Name Server (SNS): ” on page 185).
4. 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 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. See ” To check for a link
initialization failure (loop): ” on page 197 as the next potential trouble spot.