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The FC problem leads to the low performance of the single server in some bureau

Publication Date:  2012-09-29 Views:  52 Downloads:  0
Issue Description
Four servers are connected with Brocade FC switch in some bureau where the storage VIS6000+S5000 were used to provide storage service. A single server’s performance is low with the copy rate of 225KB/s. As is showed:
Alarm Information
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Handling Process
1、 For the VMware systems of the four servers are cloned from one server, if one server has the OS problems, the other 3 should have the problems too. Considering that the installation time is so long, we ignore the OS problems temporarily.
2、 Check the performance of VIS6000 and S5000, and they are both normal. The band is 50M/s and the availability is 10%, which means the problems shouldn’t come from the back-end storage.
3、Check the specified state of the link through the FC switch, and it finds that the bit error rate in the port 11 is very high, as is showed below:

4. Test to copy data in the fault server, the master link is the link connected with the port 11. Cut off this link and the performance came back to normal. As is showed:

5、Change the FC in the master link and the test performance is normal in single link.
6、Change the FC in the master link and the test performance is normal in double link.;
Root Cause
Analyzing the reason of the low performance through the figure above:
1、OS problems;
2、VIS6000 or S5000problems;
3、Physical wire problems;
4、Drive mend problems;
Suggestions
According to the steps above, it is sure that it is the link between the host and the FC switch problems that leads to this fault.
The fault link is the link between the host and the FC switch which will not be displayed in the storage of Huawei. It is recommended to check through the FC switch.

END