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Incorrect FC Host Port Mode Caused a Failure of the Storage Device to Communicate with the Brocade 5100 or Brocade 300

Publication Date:  2013-06-27 Views:  70 Downloads:  0
Issue Description
Product and version information:
  • T&Sx900 V100R100&V100R002C00SPC009 and earlier versions.
  • Switches include Brocade 5100 and Brocade 300 (all versions).
When a storage device is connected to a Brocade switch and the mode of the FC host port on the storage device is set to Public Loop, the storage device cannot communicate with the Brocade switch.
Alarm Information
None
Handling Process
1. Log in to the ISM and expand the storage node. In the navigation tree, choose Device Info > Ports.
2. Select the FC host port and right-click it.
3. Choose Modify from the shortcut menu.
4. In the Modify FC Port Information dialog box that is displayed, modify the FC host port mode to Point to Point or Switch.
Root Cause
The FC host port mode is incorrectly set. As a result, the storage device cannot communicate with the Brocade 5100 or Brocade 300. The port mode must be modified to Point to Point or Switch.
Suggestions
When a storage device is connected to a Brocade switch, set the FC host port mode to Point to Point or Switch. Otherwise, the storage device cannot communicate with application servers through the Brocade switch.

Reference Information
The FC host port mode is set to Public Loop by default. In this mode, the FC host is incompatible with Brocade 8G switches. The root cause is that Brocade and the FC chip supplier PMC had different interpretation of the FC protocol details when they were designing their products. This divergence leads to intermittent link-downs or other abnormal symptoms when the storage device is connected to a Brocade switch and the FC host port mode is Public Loop.

END