I have a number of Catalyst 3750G switches, a combination of Gb and 10/100 POE models all stacked together.
I am not a Cisco expert so they are pretty much installed as plug and play with one management switch assigned an IP address. No other tweaking/config done.
They have been in situ for a number of years.
I am just performing some performance testing on our file server in advance of getting a replacement model (Its now 3 years old).
When copying a 3.5Gb file from my C:\ to the Windows 2008 R2 server share I get a slow speed of approx 11.5Mb/s.
I have tried this from a number of different clients and to 2 different servers.
If both the client and server are plugged into the same physical switch then speeds of > 100mb/s are achieved.
As soon as I move the client to another switch it slows down again. I have tried this with sifferent clients, servers and switches as well as making sure both server and clients are negotiating 1Gb network connections ok.
I have tried a smaller file and get similar results, the only common denominator seems to be when it is cross-stack. The fact I can achieve significantly faster speeds when plugged intot he same switch at least means the server etc is capable of it.
So it appears I am not getting very good performance cross-stack.
Any ideas or suggestions on what I can do to resolve this? or other testing I can do to narrow down the problem?
Clients are Windows 7. No VLAN's in place.
Tests done using windows copy/paste and looking at the speed shown by Windows while copying.
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