Hello, I've been following the guide to setup "synchronus volume replicaiton with failover over a lan" But when I get to the point when I start the replication task, the replication runs at about 500kB/s

I'm runnig DSS on the following hardware:

DSS1
HP Proliant DL180 G6
6GB Ram
twelve 600GB 15k SAS in Raid 5
two onboard 1GB Nic's
one dualport 1GB Nic's

DSS2
HP Proliant DL180 G6
6GB Ram
twelve 1TB 7.2k SATA in Raid 5
two onboard 1GB Nic's
one dualport 1GB Nic's

I've tried installing windows on them both and copying files from one to the other and it works at 125MB/s.

In DSS I tried creating NAS volumes on each of the DSS's and copying files onto them, and again it works at 125MB/s.

I've tried replication on both block and file volumes (both replicate at an average of 500kB/s).

Any ideas would be greatly appreciated.