We are planning a slow migration from VMware (and third party apps) to open source alternatives (free would be great).
Basically, we want to start with some little cluster lab, then migrate the production environment (35+ ESX, 1500 VMs) in the future (X years, there is no hurry... yet)
Our bet is CentOS/Scientific Linux as the operating system of choice and KVM as the hypervisor.
The vCenter alternative we are thinking about, is Convirt, but we don't know if all the features we use in VMware will be supplied by Convirt (HA, DRS, clustering,...), or we should try some other alternatives (any ideas?)
The monitoring is being replaced by Nagios and the backup/replication will be replaced by some scripting magic.
So, is there anyone who can give us some advices, or in a similar situation?
PS.- This is my first question in serverfault, and my english level is not so good, but I hope the question is understandable.
PS2.- I forgot to mention that we provide also VDIs. And the alternative we've been thinking is Spice.