I can tell you from personal experience for the past 6 months, that
session sharing will NOT always force you onto the same server. I was
running only 4 CPS4.0 servers, heavily loaded, all users connecting via
PNAgent or WI via CAG. I'd say about 50% of the time session sharing
would kick in, and 50% of the time farm load balancing would kick in and
launch a new app on a different server instead of session sharing on the
same server, for any given users.
Load balancing is also "in effect", but if user a launches app a on
server a, and then user a goes to launch app b, if the load balancer
sees server a hasn't hit it's load balancing boundaries, it will launch
app b on server a as part of session sharing. If the load balancer sees
server a has hit a load balancing boundary, it will kick the app to
another server.
When I added 3 more servers, the percentages changed so that session
sharing went up and farm load balancing went down.
You should adjust your load balancer settings so that you don't let a
server get up to 80% of the total memory if that is a problem.
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of Angela Smith
Sent: Thursday, November 16, 2006 7:10 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: PNAgent and Load Balacing
Hi Rick
My main concern with Session Sharing is I always thought Published
Applications would be launched from the least loaded PS4 server. This
isn't the case as all subsequent applications are run from the same
Server hosting the first application. Because I cannot control the
amount of applications a user can open, Im concerned users may open
every application and use excess server resources. My servers
occasionally use close to 80% of the total memory (4Gb). I have a farm
of servers and have around 400 concurrent users.
You mentioned I can control the amount of apps a user runs from the 1
Host.
Where do I find this setting? All my users run their apps from the same
Host (ie the Host that lauched App1 due to session sharing) so this may
ease my burden a little knowing user A can open x amount of apps from
any one host.
Regards
Ang
>From: "Rick Mack" <Rick.Mack@xxxxxxxxxxxxxx>
>Reply-To: thin@xxxxxxxxxxxxx
>To: <thin@xxxxxxxxxxxxx>
>Subject: [THIN] Re: PNAgent and Load Balacing
>Date: Wed, 15 Nov 2006 08:37:28 +1000
>
>Hi Angela,
>
>Unfortunately, you're quite right.
>
>You can restrict the number of times a user can log on, or the number
>of instances of a specific published application that they can run.
>However while you could restrict the total number of published
>aplications a user can run on any one server, I'm not aware of any way
>you could make that work by selectively turning off session sharing
>when an application number limit has been reached.
>
>About the only way you'd get something different is if you siloed your
>applications so that different servers had different apps. But that
>would end up being slower in terms of application startup time so it
>wouldn't win you any kudos from your users.
>
>Pardon my asking, but what is the reason for your objection to session
>sharing?
>
>Regards,
>
>Rick
>
>Ulrich Mack
>Volante Systems, a division of Commander
>
>
>-----Original Message-----
>From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
>Behalf Of Angela Smith
>Sent: Tuesday, 14 November 2006 10:13 PM
>To: thin@xxxxxxxxxxxxx
>Subject: [THIN] Re: PNAgent and Load Balacing
>
>Hi Rick
>
>Thanks for the reply. Makes sense. I did a quick google on it and an
>article stated it uses the same connection for opening multiple
>applications from the same host. I want to restrict all users to
>opening 8 applications across the farm. I enabled this setting in farm
>properties but it didn't appear to work (I could open more than 8
apps).
>Is this due to session sharing?. Will opening 10 applications appear
>as
>1 application as it uses the same session hence the restriction not
>working or do I have an issue?
>
>Thanks
>Ang
>
>
> >From: "Rick Mack" <Rick.Mack@xxxxxxxxxxxxxx>
> >Reply-To: thin@xxxxxxxxxxxxx
> >To: <thin@xxxxxxxxxxxxx>
> >Subject: [THIN] Re: PNAgent and Load Balacing
> >Date: Tue, 14 Nov 2006 21:55:10 +1000
> >
> >Hi Angela,
> >
> >Things are working as designed. It's called session sharing.
> >
> >The basic idea is that the startup overhead (load user profile, group
> >policies etc) for a published application is greatly reduced if
> >subsequent published app instances are started on a server already
> >hosting one of your application sessions. That's why the first
> >published app startup is slow and subsequent ones are a lot faster.
> >
> >You can disable session sharing, but I wouldn't. It'd just slow
> >everything down quite a lot and the incidence of corrupted profiles
> >would go up quite a bit.
> >
> >regards,
> >
> >Rick
> >
> >Ulrich Mack
> >Volante Systems, a division of Commander
> >
> >
> >________________________________
> >
> >From: thin-bounce@xxxxxxxxxxxxx on behalf of Angela Smith
> >Sent: Tue 14/11/2006 21:48
> >To: thin@xxxxxxxxxxxxx
> >Subject: [THIN] PNAgent and Load Balacing
> >
> >
> >
> >Hi again
> >
> >Has anyone seen an issue where if a user opens an app from Server 1,
> >all subsequent apps are launched from server 1 even though it may be
> >published on 15 servers. The load balancer appears to be working in
> >that the user load appears to be even across the farm but no users
> >use multiple servers (they always run different apps from the 1
host).
> >
> >We use PNAgent to connect to the farm (Presentation Server 4 R02). I
> >couldn't find any settings where you can say use the same server for
> >all apps. Im concerned the load balancer is not working as it
should.
>
> >I always thought, subsequent connections would go to the least loaded
> >server regardless of what Host provided the first application.
> >
> >Thanks
> >Ang
> >
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