[CentOS] OT: Why VM?
lowen at pari.edu
Fri May 27 19:15:26 UTC 2011
On May 27, 2011, at 2:33 PM, James B. Byrne wrote:
> 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?
Well, we do virtualization for an unusual reason here. We do it to
reduce RFI, since we're a radio astronomy observatory. 15 VM's on a
pair of largish hosts generates much less interference than 15
physical boxes with less effective shielding....
Also, virtualization allows rapid changes in provisioning of storage
and other resources. It also allows rapid 're-imaging' for emergency
rollback of the whole guest. It also allows virtualization-based HA
And, most importantly, it allows you to spread the cost of multiple
guests to one or two more reliable and more capable boxes; 2 Dell
PE6950's (or equivalent four-socket multicore capable servers) is
going to cost less than 15 two or one RU boxes with equivalent
redundancy and reliability).
Plus, I don't have to buy more hardware to provision another server,
especially if it is a low-performance-requirement guest.
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