Vlan utilization

[h.wall]

What is the maximum number of pc's that can run at acceptable speeds on one vlan. I have around 600 devices on one vlan and can only do file tranfers at around 30 mb a minute. I have 6509's. All pc's are on 100 mb ports. The pc's that I am using to test do not have any erros on their ports.

[rolandshum]

Are the test PC's on the same switch or does the data traverse a trunk? If they go over 1 or more trunks perhaps you should look at the utilzation on the trunks as well as the CPU utilization on the switches.

[h.wall]

The particular test devices are in the same 6509 on the same vlan. I have another 500 to 600 pc's on the same vlan on other switches that are trunked to this one. Trunk utlization looks fine but how do you measure utliztion on a whole vlan not just one port. My tarffic on the msfc for the vlan is 1/255.