We have two iSCSI SANS both running iSCSI R3 v5.0 and are trying to replicate a volume between the two.

They are currently sat side by side but running through a VPN to simulate the architecture when one is moved off site.

Running through the vpn we are only getting replication task throughput of around 4388kb/s which on a 2.5TB volume will take a while to complete.

We are not using teamed NIC's; all replication traffic is through dedicated NIC's and all user storage traffic through separate NIC's.

Any suggestions as to how we can improve the throughput --- could it be anything to do with using Block I/O rather than File I/O???

Any suggestions gratefully received!

Cheers,
Carl