Ethernet Fabric (VDX, CNA)

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Occasional Contributor
JorgeFG
Posts: 8
Registered: ‎10-25-2010

Performance issue

Hello,

I have 2 VDX6720 with 4 ISLs. I´m doing a simple test. I copy a file between two hosts connected to the same switch, then I copy same file to another host connnected to the other switch and speed is better. Is this normal? I suppose than traffic through ISLs should be slower than local switch. Am I wrong?


Thank you!

Contributor
Brook.Reams_1
Posts: 235
Registered: ‎05-12-2010

Re: Performance issue

Jorge,

There are many factors that affect copy speed, not just the network links. For example, the host itself has multiple layers of memory caching.  The 2nd copy likley took advantage of the cached file contents and was quicker.

Contributor
danderson
Posts: 24
Registered: ‎01-03-2013

Re: Performance issue

I would suggest running a test using the tool called IPERF.  This is an open source tool that runs on two system.  One system is configured as a listener for inbound connections (server) and the other system is configured as the traffic initiator (client).  You can tweak the settings of IPERF to simulate different TCP window sizes and other parameters.  

This is a good site to quickly see how to use the software.

IPERF - The Easy Tutorial

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