[THIN] Re: biggest Citrix farm
- From: "Kinchen, Tyler" <KinchenT@xxxxxxxxxxxx>
- To: thin@xxxxxxxxxxxxx
- Date: Fri, 27 Feb 2004 12:30:51 -0500
Barry (or anyone), you ever see anyone using NetIQ's Chariot (formerly
Ganymede Chariot) or have an opinion on it's ability to simulate a load on a
Citrix farm. I know it has application scripts for ICA but have never heard
how good/bad it is? Any thoughts on it?
Regards,
Tyler Kinchen
> -----Original Message-----
> From: Barry Flanagan [mailto:barry.flanagan@xxxxxxxxxx]
> Sent: Thursday, February 26, 2004 5:54 PM
> To: 'thin@xxxxxxxxxxxxx'
> Subject: [THIN] Re: biggest Citrix farm
>
>
> Ron,
> I agree with your caution on how many servers to run in a farm. Every
> environment is different, and no test department can
> completely simulate all
> the possible scenarios customers may build. For a farm that
> large, before
> ever rolling it out I would try to simulate the environment
> with a load
> simulation tool like Mercury Interactive's Load Runner with the Citrix
> Virtual User. For an environment that is approaching 300 or
> more servers ,
> MI (or one of their competitors) is a worthy investment. I
> like MI because
> you can record a user session then kick off a large quantity
> of sessions per
> client. MI says you can simulate 100 from a beefy client test machine,
> though in my experience more than 40 is pushing it (not sure what MI
> considers beefy). Not many corporations would rollout a
> project with 300-500
> web servers without simulating the load first.
> If you simulate the load before you roll out, you should find any weak
> points before production. The key of course is simulating
> what real users
> will do. MI cost a lot of cash, unfortunately. If the
> customer already uses
> it for web simulation, adding the Citrix VU is a lot easier
> to swallow. I
> agree that you cannot pitch a design based on test numbers
> that may or may
> not apply to your environment. Load simulation should give
> you a lot more
> confidence. All you have to do is convince the ones with the
> money it is
> worth it. <g>
>
> Those numbers you heard about test are a bit different from what my
> experience has been. I saw the test environment when they had
> 1000 servers
> in the farm. They regularly test 500 in a farm (at least once
> for every new
> release). They keep about 250 servers in the scalability lab
> (test Level 2).
>
>
>
> FR3 was tested with up to 800 servers in a zone. Another
> interesting number
> was IMA start time was reduced from 8 minutes in a 250 server
> farm (for Fr2)
> to under a minute (for Fr3). That alone should greatly
> improve scalability.
> These numbers were presented at iForum I believe. As I
> mentioned before,
> your mileage may vary.
>
>
> Thanx,
>
> Barry Flanagan
>
>
> * From: "Ron Oglesby" <roglesby@xxxxxxxxxxxx>
> * To: <thin@xxxxxxxxxxxxx>
> * Date: Thu, 26 Feb 2004 14:05:19 -0600
> In one farm... You had better retalk to Citrix consulting. The test
> engineers and Citrix CCS architects I deal with don't want to
> sign off on
> anything larger that 400+ servers in the SAME farm. Different
> frams in the
> same environment is different.
>
> Hell Test says they haven't even tested much bigger than 400
>
> Ron Oglesby
> Senior Technical Architect
> Microsoft MVP - Windows Server
>
> RapidApp, Chicago
> Mobile 815 325-7618
> Office 312 372-7188
> e-mail roglesby@xxxxxxxxxxxx
>
>
>
>
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