[SAC] New Vms w/ Debian 7

[Martin Spott]

On Sat, May 10, 2014 at 02:23:46PM +0200, I wrote:

> [...]  The bottleneck is still going to be disk I/O, because from a
> physical block device perspective the task hasn't changed.

BTW, for the sake of completeness:
I perfectly agree with isolating the LDAP service into a separate VM
("Secure") for security as well as HA reasons.  I agree with separating
the main web service into a separate VM ("Web") because it relies on
Drupal 5.x which, in turn, requires an insecure and unsupported version
of PHP.  I agree with having one VM to be administered by everybody
until it's dead or hacked and can quickly get shut down without further
concern (I guess that's our "Webextra" or the "Adhoc" VM).

I'm sure there are more *organisational* reasons for isolating certain
services, but we should take care of being specific about the
respective reasons and not raise unrealistic expectations like
performance improvements by isolating a service into it's own VM on the
same host.  The underlying storage hardware simply doesn't now it's
serving different VM's - the recommendation to use the "noop" scheduler
inside the KVM VM's is my witness  ;-)

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