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From David Nalley <da...@gnsa.us>
Subject Re: AutoScale feature....
Date Tue, 03 Jul 2012 01:24:58 GMT
On Mon, Jul 2, 2012 at 2:08 PM, Ram Ganesh <Ram.Ganesh@citrix.com> wrote:
> Hi All,
>
> Briefly talking about the feature - AutoScale feature allows you to scale up or scale
down the virtual instances that are being load balanced by load balancers like NetScaler based
on certain conditions. This feature is an extension to the ELB feature in CloudStack. This
feature is similar to AWS autoscale feature except that monitoring of server's(guest vm) health
is done by load balancers like NetScaler and provisioning is done by CloudStack. Monitoring
done by loadbalancers has couple of benefits
>         - Loadbalancers are better placed to understand the health of the  server as
traditionally LB devices had monitoring capability inbuilt in it.
>         - Decisions can be based not just on certain conventional counters like CPU,
Memory etc but also on network counters like response time, bandwidth, connections etc
>         - Decreases the load on CloudStack management server.

But that inherently limits where AutoScale will work. This means all
of this work is inherently very niche, can only be tested by folks
with NS hardware,  and only utilized by the same folks - and
autoscaling could be inherently useful in other situations that don't
have LB implications.
CloudStack has inherently been hypervisor agnostic, is there a reason
not to be LB agnostic as well?

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