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The configuration mode of the FC host port set wrong and causes the storage can’t communicate with the Brocade switch

Publication Date:  2012-11-08 Views:  95 Downloads:  0
Issue Description
Product and version:
•S5500T V100R001 V100R002
•S5600T V100R001 V100R002
•S6800T V100R001 V100R002
The switch is: Brocade 5100、Brocade 300 (all version)
When the storage device connecting with the Brocade switch and the “configuration mode” of the FC host port of the storage device is “arbitrated loop”, the storage can’t communicate with the Brocade 5100 or Brocade 300 switch.
Alarm Information
none
Handling Process
Set the “configuration mode” of the FC host port as “point to point” or “switch”.
1. Login in the ISM, unfold the storage node which needed to be operated and select “device information > port” in the navigation tree.
2. Select the FC host port which is needed to be revised and right-click the FC host port.
3. Select the “modification” in the ejecting shortcut menu.
4. At the ejected dialog box “modify the FC port information”, set the “configuration mode” of the FC host port as “point to point” or “switch”.

Root Cause
The “configuration mode” of the FC host port sets wrong, and leads to the storage device can’t communicate with the Brocade 5100 or Brocade 300 switch.
Suggestions
While the storage device connecting with the Brocade switch, please set the “configuration mode” of the FC host port as “point to point” or “switch”, or the storage device can’t communicate with the application server via the Brocade switch.
The default “configuration mode” of the FC host port is “arbitrated loop”, however, the “arbitrated loop” isn’t compatible with the Brocade 8G series switch. The root cause is the FC chip supplier PMC and Brocade don’t have the same understanding of the FC protocol’s detail, then causes the phenomena that there are intermittent disconnections or can’t communicate normally while the FC host port of the storage device connecting with the Brocade switch via the “arbitrated loop” mode.

END