One of the first questions when virtualizing XenApp is how many VMs to put on a server. Well, that was discussed in the Virtualize XenApp blog. Once you figure out how you plan to carve up the physical server, one of the next common questions is deciding which features of the hypervisor to enable/disable. For example, if I use XenServer, should I use the “Optimize for XenApp” setting? What about vSphere’s Transparent Page Sharing feature? And the big whopper, how should I allocate memory to my virtualized XenApp servers? Is it safe to use dynamic memory or am I safer to stick with fixed memory?