I have setup up a DSS V6 lite server as a VM on a Xenserver 5.6 host. The volume assigned to the DSS server is local to the host and is part of a hardware raid5 on the Dell 2950 server.

I've set up a nas share and it works as expected tied into our AD with the exception that throughput is very slow. Copying files to or from the device max out at 6 MBps.

I have a windows 2008 VM on the same host and copying files to and from it average 86MBps.

There is only one NIC assigned to both vms (the same NIC) and everything else is shared as well, so I don't think it is a hardware issue. My guess is that it is the NIC driver on the DSS server, but have no idea how to test it.

Are there any good whitepapers or documentation on troubleshooting performance issues?