[Gllug] best way to update a single production server?

[John Hearns]

2009/5/1 Karanbir Singh <mail-lists at karan.org>:
> Khusro Jaleel wrote:
>> Another option might be to use VMs? So we setup each server with 2
>> VMs, so while we update 1, the other one takes over, but uses the same
>> IPs?
>
> This depends a lot on the performance level's you are expecting. In many
> cases, native performance > VM performance.
>
That's something worth exploring actually.
A couple of years ago IBM produced a white paper where they measured
infiniband connected machines as having performance within I thin 5%
of native machines doing the same computation. I'm not sure what the
current state of this is.

Also for desktops Intel's VT-d gives direct access to a netork card
and a graphics card from a virtual machine, which is very interesting.
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