Performance may or may not be impaired, depending on your routing algorithm,
typical use patterns and number of servers at each layer. In most cases,
even with the additional overhead of a high availability architecture,
deploying two or more servers will typically improve overall system
performance. (Please note that performance is not linear to the number of
servers, so using three server will NOT triple performance.)
At the same time, your overall reliability and scalability will be MUCH
better. Plus, you'll be able to insert/remove servers from the cluster as
needed, without taking the application offline.
You didn't mention it but the primary disadvantage of a true clustered
solution is cost, which can easily be 2-5 times more expensive than a
"standard" BMC Remedy deployment.
-- Bing
Bradford Bingel ("Bing")
ITM3 California
http://www.itm3.com/
[EMAIL PROTECTED] (email)
925-260-6394 (mobile)
-----Original Message-----
From: Action Request System discussion list(ARSList)
[mailto:[EMAIL PROTECTED] On Behalf Of Carey Matthew Black
Sent: Monday, September 25, 2006 2:07 PM
To: arslist@ARSLIST.ORG
Subject: Re: Remedy 7.x Load Balancer
Karee,
In general, "performance" has little to do with "High Availability".
In fact the higher your "performance standards" are the more you
should be buying when you setup your "High Availability" environment.
Because, you want more performance you have to buy bigger boxes on
both halves of your HA environment to deal with all of the load on 1/2
of your "High Availability" environment to cover the event of a
failure of 1/2 of the HA. And there is a diminishing return on the
theory of "larger box = better performance" curve.
Not to mention that most HA solutions actually add more routing logic
into the mix which is bound to cost you some performance in the the
grand scheme of things. How much of a cost that would be is likely
negligible to the "performance hit" of a production server down for
even one minute. :) So that cost is normally ignored. But the first
time you are bit by a "Load balancer change" that routes your traffic
off to China and back before it finally gets where it should be
going... well you will notice that kind of "logical mistake.
--
Carey Matthew Black
Remedy Skilled Professional (RSP)
ARS = Action Request System(Remedy)
Love, then teach
Solution = People + Process + Tools
Fast, Accurate, Cheap.... Pick two.
On 9/25/06, Lang, Karee <[EMAIL PROTECTED]> wrote:
> **
>
>
>
> Hi,
>
>
>
> We will soon be upgrading our ARS hardware architecture and are in the
> process of deciding whether we should move to a true clustered/load
> balancing environment. I feel confident we will be gain better reliability
> and scalability by doing this.however, can anyone speak to the performance
> gains achieved with this setup?
>
>
>
> Thanks!
>
> Karee L. Lang
>
> Turner Technology Services
> Director, Client Systems Infrastructure
> Turner Broadcasting System, Inc.
> 404.827.4243
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