I think I've managed to isolate the problem to the Adaptec 5405 RAID Controller.... we're going to throw in a SATA HDD tonight and bypass the controller, install proxmox and test.
The problem is not present on another platform (proxmox1.6 also) which is running a different RAID controller...
Did the reinstallation help the 'broken' server?
We are experiencing very similar problems. pveperf gives great results, but rsync transfer speeds are <1-2mb/s
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