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Nice article, and I also were at the presentation in Copenhagen. I was one of those bastards rasing my hand when you asked about Lefthand customers :-) You said that HP Lefthand was Non-uniform storage, but I think it really depends on which level of redundancy you configure it for. In our case, we use Network RAID10 wich makes all the nodes active in our case, and the ESX-hosts can access storage boxes on each site. We implemented this solution in January using vSphere 4.1 Update 1, and it has been working great the entire time. Didn't know it was an unsupported setup until I attended your session, so now we will speed up the 4.1u1->5.0 process so we have a (more) supported setup. Basically, we have three datacenters in this setup, they are all connected with redundant dedicated black fiber links (lit up with 10Gbit links). In Site A, we have ESX-hosts 1,3,5,7,9 and storage boxes 600-1, 600-3, 1000-1, 1000-3. In Site B, we have ESX-hosts 2,4,6,8,10 and storage box 600-2, 600-4, 1000-2, 1000-3. In site C, we have our vCenter and our FOM (Fail Over Manager, which would be the witness server). We have lost the storage in Site A without any problems (we pulled the plug on all the storage boxes in Site A to test), and we have done planned maintenance on Site B without anything going down (maint.mode on esx hosts, migrate VMs to Site A with vMotion). Affinity rules for the VMs make sure they are in the right DRS cluster. I hope this setup will be supported in the future by VMware as well, but since we are using best practice from HP we don't see any problems at the moment. I like the VPLEX concept, I think we might look in to it in the future. Thanks for a great session! :)
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Oct 21, 2011