
On avg our Veeam backup jobs speeds are between 70MB/s to 600MB/s in SAN Mode.
These VMs are 80 - 100GB in size, and all run on VMFS Luns formatted with 1MB block size.
Recently we created new VMs on new vmfs 4MB block size LUNs, as these new VMs each require 2 x 1TB vdisks.
Although at the moment most of the space in the 1TB vdisks are unused, we were pleasantly surprised by the backup time of 5mins, and a processing rate of 8GB/s !!!!
A new SAN Mode speed record?

Any idea why the smaller VMs on 1MB block size LUNs don't achieve close to those speeds?
BTW, our config is as follows:
1 x physical VeeamBackup server (HP BL460c Blade)
HP BL465c Blade vSphere 4.0 Hosts
HP EVA 8100 Storage Arrays.
All 4GB SAN Switches & HBAs.