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Abnormal Startup

Publication Date:  2012-07-18 Views:  54 Downloads:  0
Issue Description
The storage resources of an S6800E is reallocated after it is moved to another place. The controllers are connected to two FC switches and the storage space is mapped to the Solaris OS. When commands are executed to check the device information, the discovered number of paths is different from the anticipated number. A disk link to C5 is lost. The FC switches are normal.
Alarm Information
Handling Process

Step 1 Check the host ports on the S6800E and find that the status of a port is unconnected.

 Step 2 Check that the default rate of the specific port is 4 Gbit/s.

 Step 3 Check port rates in the storage system and find that port rates are inconsistent.

 Step 4 Adjust the rate of the port to 2 Gbit/s. The fault is rectified.

Root Cause
In this case, the FC switches used by the customer are of two models. One of the two switches supports only 2 Gbit/s rate, but the rate of the corresponding port is 4 Gbit/s. Inconsistent rates cause that the discovered number of paths is different from the actual number.
When the S5000 is deployed in the existing SAN network, pay attention to the maximum rate supported by current FC switches. After all ports are configured, check whether port rates are consistent. If inconsistent port rates exist, try to connect different ports to check whether a port is faulty.