IIS application starts in several pools

Hello everyone,

I have a number of virtual applications hosted in IIS (Windows Server 2008 R2 SP1, Windows Server AppFabric 1.0). Each application has its own application pool assigned. Sometimes when I deploy a new version of the application I see that it has actually started in two separate application pools: this can be observed in the app's logs - the same activities are performed in separate Windows processes (w3wp.exe) owned bydifferent pools.

What am I doing wrong? Is there any fix for this?

Thank you.