On 05/12/2012 12:46 AM, Gordon Messmer wrote:
A late reply, but hopefully a useful set of feedback for the archives:
Well let me share my experience as well.
On 04/20/2012 05:59 AM, Rafał Radecki wrote:
Key factors from my opint of view are:
- stability (which one runs more smoothly on CentOS?)
I found that xenconsoled could frequently crash in Xen dom0, and that guests would be unable to reboot until it was fixed. I also found that paravirt CentOS domUs would not boot if they were updated before the dom0. In short, Xen paravirt was very fragile and troublesome. I never tested Xen with hardware virtualization.
I have had no such problems with KVM. In my experience KVM is much more stable than Xen paravirtualization. Xen HVM probably would suffer at least some of the same problems.
I have some machine that were very unstable under load (max uptime some weeks, then a crash). They were running CentOS5 with XEN kernel. First I thought it was hardware related, but once a non-Xen kernel was loaded and I migrated the VMs to KVM the machines are rock solid. I must say I still have two machines running Xen and they have no problem the last year. So it's probably also related to the specified hardware configuration.
Theo