[CentOS] OT: Why VM?

Fri May 27 18:46:24 UTC 2011
Jim Wildman <jim at rossberry.com>

Server utilization and seperation.  I need 10 web servers, none of which
are going to be busy, but each organization in my business wants their

10 vms on a 2 cpu box makes more sense that 1 web server on each of ten.
Add a second vm host for some redundancy, etc, etc.

On Fri, 27 May 2011, Digimer wrote:

> On 05/27/2011 02:33 PM, James B. Byrne wrote:
>> 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?
>> We run our own servers at our own sites for our own purposes.  We do
>> not, with a few small exceptions, host alien domains.  So, while
>> rapidly provisioning or dynamically expanding a client's vm might be
>> very attractive to a public hosting provider that is not our
>> business model at all.
>> Why would a small company not in the public hosting business choose
>> to employ VM technology?  What are the benefits over operating
>> several individual small form factor servers or blades instead?  I
>> am curious because what I can find on the net respecting VM use
>> cases, outside of for public providers or application testing, seems
>> to me mostly puff and smoke.
>> This might be considered OT but since CentOS is what we use it seems
>> to me best that I ask here to start.
> Live migration between physical hosts. Also, ease of recovery in the
> event of a failure. Can move the VM to entirely new hardware when the
> old hardware is no longer powerful enough... etc.

Jim Wildman, CISSP, RHCE       jim at rossberry.com http://www.rossberry.net
"Society in every state is a blessing, but Government, even in its best
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