[CentOS] OT: Why VM?

Mon May 30 10:11:00 UTC 2011
John Doe <jdmls at yahoo.com>

From: James B. Byrne <byrnejb at harte-lyne.ca>

> I have been working off and on with Xen and KVM on a couple of test
> hosts for that past year or so and while now everything seems to
> function as expected, more or less, I find myself asking the
> question: Why?

I saw a company architecture presentation where they had paired servers with 2 VMs each + DRBD + heartbeat...
So, on each server there is an active VM and a 'backup' VM, crossed.
If one server goes down, the 'backup' VM on the second server would be activated.