Brocade® Product Training
Brocade® Product Training
Brocade® Product Training
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SAN Troubleshooting Approach<br />
14<br />
Host<br />
Fibre Channel Fabric<br />
Storage<br />
The “Cable”<br />
To troubleshoot this scenario (assuming a single switch SAN),<br />
you must concentrate on:<br />
‣The Storage<br />
‣The Host<br />
‣The HBA<br />
‣The Host OS/Driver<br />
‣The Cable/Terminator<br />
© 2005 Brocade Communications Systems, Incorporated.<br />
Revision CFP261-02-2005<br />
Chapter 8 - 14<br />
‣The FC Media (SFPs/GBICs/GLMs)<br />
‣The Switch and Brocade Fabric OS<br />
‣Heterogeneity<br />
How do you troubleshoot?<br />
Start at the switch switchshow and error log then look<br />
at additional supportshow output<br />
At a conceptual level there are really only three “pieces”: the storage, the host and the<br />
“cable”.<br />
Start in the middle and determine if you are “above” or “below” the problem.<br />
HBA – Host Bus Adapter<br />
GBIC – Gigabit Interface Converter<br />
SFP – Small Form Factor Pluggable<br />
GLM – Gigabit Link Modules<br />
How do you troubleshoot this? Use the process of deduction and logical elimination with<br />
an added caveat – Fabric problems could effect other devices in the Fabric. An example<br />
would be a marginal connection to an HBA. This could cause problems to any devices this<br />
marginally connected HBA accesses. This would not have occurred outside of the SCSI bus<br />
in the traditional world.<br />
© 2005 Brocade Communications Systems, Incorporated.<br />
Revision CFP261-02-2005<br />
Chapter 8 - 14
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