Slow data move times

We have 2 x 8040 clsuters and have just added an 8080. Due to space constraints we have started Volume moves within the cluster, 8040 to 8080.  2322 10/29/2015 14:01:13 Volume Move dc1nc1-01 running Move "vault_PriHvc1Vol003" in Vserver "dc1_snapvault" to aggregate "agg_dc1nc1n5_sata01" Transferring.


The problem is that the transfer rate is far too slow, on average we are moving 2 meg per second, I understand tha these moves operate as backgrund tasks but 2 or 3 TB moves are going to take forever which is ridiculous. Does anyone have any odeas please