Hi all,

I've set up a nice Ubuntu+KVM based DRBD cluster and everything seems to fine except for when I try to view one of the websites running inside one of my virtual machines - it's really slow... I have LXDE installed on the host and have tested viewing the VM websites there and they are extremely fast - only about 2-3 seconds for a fairly complex page (compared to about 25 seconds when I view the same site externally). Because of this, I don't think it's a problem with Apache or KVM disk I/O.

I suspect that the problem is with the new switch I put the servers behind, but I can't be 100% sure. What tools should I use to detect where a network bottleneck is? I'm toying around with iperf at the moment, but my boss is looking to me for an absolute as to what and why the connection is slow.

Thanks