Application Pooling - Which setting should I use?

[Michelle]

Hi There,

I am trying to decide which application setting (high, medium or Low)
that I should be using for my virtual servers.

I have many IIS5, windows2000 machines. Each machine has 3 or 4
virtual servers with 20 applications on each v. server

For any application that is at high risk (dll's or just flaky) we have
set as high. All other applications are set at medium.

We ran into a problem where a medium application corrupted all the
medium applications on the server. It did this to applications which
were not on the smae virtual server.

My question is: What should the virtual servers application pooling be
set to? If I set each to high would mean a big drag in performace?

And can some one tell me more about how what exactly high would mean
with the memory space that iis uses?

Thanks,
Michelle
(zzt...@excite.com)

[John Wiese [MS]]

Michelle,

When you mark a VDir as "High (Isolated)" it will get it's own process
space. This means that it get a Virtual 2gig usermode memory space to use.
It also means that it will consume more resources than if it was running
in the "Medium (pooled)" mode with all the other "Medium (pooled)"
applications.

Most of the time you would want to run your applications in "Medium" so
that you do not use as many resources. Should you encounter a problem,
then you could begin to isolate the apps into their own "High" space to
determine where the problem lies.

If you only have a couple of apps then you may want to run them in "High"
to isolate them from each other anyway, assuming the box can handle it.

Thank you for using the Microsoft Communities,

John Wiese
Microsoft Support

This posting is provided "AS IS" with no warranties, and confers no rights.
You assume all risk for your use. © 2001 Microsoft
Corporation. All rights reserved

[Michelle]

John,

Thanks so much for replying.

I have some of my apps in High becuase they are flaky (developers
code). The rest are in medium.

Question for you or anyone who reads this:

What should level I set application pooling on my virtual servers at?
Leave at medium or set to High?

Example: I have box X. It has virtual servers A,B and C on it. There
are some apps that are high in each virtual server. The virtual server
root is set to medium for A,B and C. I have had an app in A that is
set to Medium that corrupted all the medium resources on A, B and C. I
thought that each virtual server (A,B and C) would have its own unique
memory space that the application under it run in. (So three 'sets' of
medium space) But it seems that this is not the case and medium is
shared across the box.

I would like to know if I set application pooling on A,B and C to high
(so at the root level itself) if this would have a big impact on
performace.

Also would this protect apps on server B and C if an application on A
goes flaky again?

Thanks,
Michelle

jwiese...@microsoft.com (John Wiese [MS]) wrote in message news:<$oKeJTvCCHA.1340@cpmsftngxa07>...

[Tim Coffey]

The best perf is to run everything in Low, but you cannot do that w/out
taking down the entire server when an app goes bad. I would leave suspect
apps in High, and anything you have that you know is stable and will not
crash run in Low (inetinfo). Then go medium for anything you are not sure
of. For example, if you have a site that is just static content, Low. Or
some simple ASP. Database stuff, better go medium, and high if they are
crashing a lot.

Thank you. I hope this information is helpful.

This posting is provided “AS IS” with no warranties, and confers no rights.
You assume all risk for your use. © 2001 Microsoft Corporation. All rights

reserved.

[Michelle]

Thanks for all your help with how to set the application pooling for
applications.

Now what should I set the application protection on my virtual servers
to be? How does setting this affect the running of applications under
the virtual servers?

Is there any good links that anyone knows of that discusses
application protection on virtual servers?

Thanks,
Michelle