HP StorageWorks Fabric OS 6.x administrator guide (5697-7344, March 2008)

310 Troubleshooting
There are a number of settings that control the overall behavior and operation of the fabric. Some of these
values, such as the Domain ID, are assigned automatically by the fabric and can differ from one switch to
another in the fabric. Other parameters, such as the BB credit, can be changed for specific applications or
operating environments, but must be the same among all switches to allow the formation of a fabric.
The following fabric parameters must be identical for a fabric to merge:
• R_A_TOV
• E_D_TOV
• Data field size
• Sequence level switching
• Disable device probing
• Suppress class F traffic
• Per-frame route priority
• Long distance fabric (not necessary on Bloom-based, Condor, or GoldenEye fabrics)
• BB credit
• PID format
To reconcile fabric parameters individually:
1. Log in to one of the segmented switches as admin.
2. Enter the configShow command.
3. Log in to another switch in the same fabric as admin.
4. Enter the configShow command.
5. Compare the two switch configurations line by line and look for differences. Do this by comparing the
two Telnet windows or by printing the configShow output. Also, verify that the fabric parameter
settings (see the above list) are the same for both switches.
6. Connect to the segmented switch after the discrepancy is identified.
7. Disable the switch by entering the switchDisable command.
8. Enter the configure command to edit the fabric parameters for the segmented switch.
See the Fabric OS Command Referencefor more detailed information.
9. Enable the switch by entering the switchEnable command.
Alternatively, you can reconcile fabric parameters by entering the configUpload command for each
switch.
To download a correct configuration:
You can restore a segmented fabric by downloading a previously saved correct backup configuration to the
switch. Downloading in this manner reconciles any discrepancy in the fabric parameters and allows the
segmented switch to rejoin the main fabric. For details on uploading and downloading configurations, see
”Maintaining Configurations” on page 131.
To reconcile a Domain ID conflict:
If a Domain ID conflict appears, the conflict is only reported at the point where the two fabrics are
physically connected. However, there may be several conflicting Domain IDs, which appears as soon as
the initial conflict is resolved.
Typically, the fabric automatically resolves domain conflicts during fabric merges or builds unless Insistent
Domain ID (IDID) is configured. If IDID is enabled, switches that cannot be programmed with a unique
Domain ID are segmented out. Check each switch that has IDID configured and make sure their Domain
IDs are unique within the configuration.
Repeat this procedure until all Domain ID conflicts are resolved:
1. Enter the fabricShow command on a switch from one of the fabrics.
2. In a separate Telnet window, enter the fabricShow command on a switch from the second fabric.