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codeulike
Asked: 2009-12-15 08:02:51 +0800 CST

OWA and IIS Application Pools - recommended Recycling policy?

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My sys-admin colleagues have an Exchange 2003 R2 SP2 server running Outlook Web Access (OWA) through an IIS 6 server (naturally).

OWA seems to crash every couple of weeks. Looking at the Application Pool recycling in IIS, I notice that all of the Recycling options (by time, by number of requests, fixed time etc) are switched off.

Would it be a good idea to switch on Application Pool Recycling (e.g. at 3am every day or something like that) or is recycling the Application Pool not recommended for OWA?

edit: Inconclusive answers so far ... Has anyone else tried this?

iis-6

2 Answers

  1. ExchangeApplicationPool shouldn't be recycled, if it is configured to then OWA can become unreliable.

    In a default install of Exchange 2003 on Windows 2003 it looks like this:

    Recycling Tab

    • Everything Unchecked

    Performance Tab

    • Shutdown worker processes after being idele for (unchecked)
    • Limit the kernel request queue (checked - 1000 Requests)
    • Enable CPU Monitoring (unchecked)
    • Maximum number of worked processes (1)

    Health Tab

    • Enable pinging (Checked 30 seconds)
    • Enable rapid-fail protection (Checked)
      • Failures (5)
      • Time Period (5)
    • Startup time limit (90)
    • Shutdown time limit (90)

    Identity Tab

    • Varies depending on options

    KB906907 : Instructions on re-creating the ExchangeApplicationPool

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  2. There should be no harm in recycling your OWA application pools. Choose a time when your users won't reasonably be on it and do it then.

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