We currently have vSphere 5.0 hosting VM's on HPDL360 with Citrix XDT 5.6 providing VDI.
The hosts are pretty much maxed out during the day.
We have the fortune of having an HP 7000 series chassis and two blades. My plan is to buy one more blade, and enough RAM to take all three to 384GB. This should give us 2.5x the GHz and 50% more RAM than we have currently.
I'm trying to think of the best way to migrate from the old to the new hardware will keeping everything up.
An important point is that XDT 5.6 will NOT talk to vCenter 5.5, so I have to keep vCenter 5.0 up until I can get Citrix XDT 7.6 up on the new blades. Fortunately I have another vCenter license and enough ESXi license to run two of my three blades and those two can handle my full load.
My current plan is to stand up two new blades on ESXi 5.5 and stand up vCenter 5.5. Then stand up the virtual security and backup appliances in vSphere 5.5.
I will then begin to power down servers (not related to Citrix XDT 5.6) in vSphere 5.0 and discover them in vSphere 5.5 on the SAN, boot them, update vhardware, etc. I’m not sure, but I don’t think you can move machines from vSphere 5 to vSphere 5.5.
Then I'll stand up the new Citrix XDT 7.6 infrastructure inside vSphere 5.5. I'll test XDT 7.6 until all users are happy and then decommission the XDT 5.6 infrastructure. Then decommission the vSphere 5.0 infrastructure, move the old hosts to the DR site, set them up in vSphere 5.5 as an SRM recovery site.
That's my plan, but I'd love to hear if I'm missing something if there are better ways. One bonus question. I have two virtual Citrix Netscalers (VPX). Any input on moving them from vSphere5.0 to 5.5?