MDS 9124 Performance

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Aug 7th, 2008
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I've been monitoring the performance of my MDS 9124 FC switch and have some concerns. The transmission rates are peaking at over 700 MB/s when the port is only rated at 400 MB/s on the 4Gb switch. Is this normal or does it indicate a problem?

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Michael Brown Thu, 08/07/2008 - 09:47
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That doesn't sound right to me....on a single port, the through put should max at 400MB. You not looking at a port-channel by any chance are you? Sounds like it might be reporting a combination of 350MB ingress and 350MB egress.

sidbartle Thu, 08/07/2008 - 17:23
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Check to see if the counters are in 64bit, I have seen 32 bit counter wrap to graph the data and give readings like this.

From memory the mrtg cfg file needed to have something like this

Target[]: #fc1/1:[email protected]:::::2

by default I the configuration file had

Target[]: #fc1/1:[email protected]

Michael Brown Thu, 08/07/2008 - 20:18
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I would suggest opening a case with Cisco TAC, or your MDS support provider and request it be investigated. I believe it's cosmetic...and I would use the command line to monitor the situation.

marsnow Tue, 08/19/2008 - 05:15
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Excluding FM out of the equation what performance do you see from CLI?


sh int fcx/x count br

If this also shows 700MB/s then it is a SAN OS issue not FM.


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