[CentOS] Emulate RHEV On CentOS - A note on Xen v. KVM

Wed Sep 7 14:05:09 UTC 2011
Digimer <linux at alteeve.com>

On 09/07/2011 09:57 AM, Always Learning wrote:
> On Wed, 2011-09-07 at 09:51 -0400, Digimer wrote:
>> Red Hat is a business, and made a simple business decision. Maintaining
>> Xen support would have meant maintaining a very large set of patches.
>> They made the decision that the effort (and money) needed to maintain
>> Xen outside of the mainline kernel was not worth it.
> Perhaps a silly question, but why maintain patches ? Why not compile a
> new version and discard all the patches ? Patches are a messy manner to
> maintain programmes.

That's the form they come from the community in. You'd have to ask the
devs for details.

>> KVM was not chosen over Xen so much as KVM was a much less expensive
>> hypervisor to support. As for it being mature or not; Well, put on your
>> kevlar pants because that is a matter of opinion.
> Which is better on C5 and C6 ?

For what? That is a loaded question.

For me, I use C5 + Xen when I am backing *nix VMs and c6 + KVM when
backing MS VMs as the PV drivers for windws are less than ideal.

>> As a follow-up, Xen dom0 support began getting into the mainline kernel
>> at 2.6.33 (EL6 is based on 2.6.32). It is very likely that we will see
>> Xen dom0 support returned in the next major release.
> In about 4 or 5 years ??? :-)

They tend to release a new x-stream release every three years. EL6 is a
year old, so I'd bet in two more years we will see EL7 and that both KVM
and Xen will be supported.

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