[SAC] New Vms w/ Debian 7

[Martin Spott]

On Fri, May 09, 2014 at 12:20:42PM -0700, Alex Mandel wrote:

> The fastest way to get there seems to be to do a new Base VM based on
> debian 7 and clone it. This would be a good idea if we want to start
> making smaller VMs to split apart some services into more isolation.

I don't see the net benefit of "more isolation", to me that's a
solution looking for a problem.  The problem we need to solve (TM) is
insufficient disk I/O, but we're not going to solve it by isolating
different services into more VM's.
>From a practical point of view the difference between a) 12 different
services running in 6 VM's (2 per VM) hammering on a slow I/O subsystem
compared to b) 12 services running in 2 VM's (6 per VM) hammering on
the same I/O subsystem (or even one VM for every service) is rather
esoteric.  The bottleneck is still going to be disk I/O, because from a
physical block device perspective the task hasn't changed.

The solution to our problem is improving disk I/O performance, reducing
latency in our widely mixed use case and once we've arrived there, I'm
sure (almost) everybody will be happy - even without "more isolation".

Cheers,
	Martin.
-- 
 Unix _IS_ user friendly - it's just selective about who its friends are !
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