If I could edit my original post (better nettiquete?), I would change that I am going to use MPIO instead of 802.3ad since XenServer supports it, although it is not the easiest thing in the world to configure, I'd like the additional throughput (400MBits/sec theoretical max vs. 100MBits/sec).
I don't want to discuss MPIO vs. 802.3ad, just if I should change anything / add anything hardware side before I begin to think about deploying this server to a production SAN.
MPIO smart move , make sure the have 3Ware Write Cache enabled but Lite version does not have RAID controller functions so if possible this should be on the DSS V6 posting so that others are not confused.
Could you move this article to the appropriate location and modify my original subject to " DSS V6 / XenServer 5.6 / ~20 VMs advice please" ? Thanks. I'll definitely be adding relevant information as I get further into my configuration. I think more data on iSCSI / MPIO / Xenserver would be good for the community. I'll post my results - but yeah - move the thread. I've got a blog, I could post a best practices article there too as I delve further into the fire.