Re: IIS6 hang
From: Pat [MSFT] (patfilot_at_online.microsoft.com)
Date: 07/10/04
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Date: Fri, 9 Jul 2004 23:16:30 -0700
Next time it hangs, run IISState (www.iisfaq.com) against the w3wp.exe
process and post the resulting log. We will hopefully be able to identify
the issue from that.
iisstate -p <pid of w3wp.exe> <enter>
Pat
"fred" <anonymous@discussions.microsoft.com> wrote in message
news:2ab3d01c465fc$85b852b0$a301280a@phx.gbl...
> front end
> windows 2003 server/IIS 6
>
> back end
> cluster 1 active/passive
> 2 windows 2003 servers
> sql 2000
>
> cluster 2 active/passive
> 2 windows 2003 servers
> sql 2000
>
> about 800 sessions to IIS at any given time from onsite
> staff and users remote locations
>
>
> Our in house asp applcation is causing IIS to hang
> and sometimes not return content from specific pages. This
> problem has followed us from a 2000 IIS 5 server
> previously hosting the app. I have been attempting to
> isolate this issue, but I really dont have any way to
> pinpoint which specific pages need addressed to inform our
> web developers to look at. I'm taking a look at the iis
> crash and hang agent or iisstate to help me out. Our dba
> along with the programmers adding some custom auditing to
> our pages to write to a sql table to basically document
> when a page was ran and when it finished which I am
> assuming is the intial call to sql from the asp file and
> the data then returned to iis. Sometimes during a problem
> we see the call to sql, the query finish and the data
> reutrn to iis, but iis never returns the data to the
> client browser(in this test, all systems are in house,
> 100mb, non networking issue). We are thinking now this may
> be part of the problem with 2 extra sql calls for each
> page accessed so we have since removed that
>
> The server was installed about 2 months ago,
> hardly any 3rd party software, dell openmanage, and this
> asphugeupload dll for some specific content, also veritas
> netbackup. There are 3 com components, 2 that are just
> compiled vb scripts that query active directory for user
> account information, and another which queries some
> information from another server. The server hosts 6
> different websites in which 1 of the sites receives 90% of
> the traffic. I have recently created 6 diff application
> pools and moved each website into its own unique pool to
> hopfully help me recover from a hang by recylcing worker
> processes /restarting the 1 website without having to
> restart iis or reboot the entire server. I have not had
> the server hang since creating the pools(its only been a
> wek or so), but the problem is very infrequent sometimes
> only once in 2 months or so. I should also mention that
> the application is continously receiving updates...we move
> new content to the server mutiple times during the week.
>
> To get to the point I have a couple of basic
> questions.
>
> 1. I do not have anything in the logs showing any type of
> error. What is the best way to get input on what the
> problem with the content is. Since I cant reproduce
>
> the problem, I'm having a really difficult time in
> determining what it is. What type of logging is the best
> practice for this. I installed the IIS crash/hang agent it
> worked fine in 2000. In 2003 server Im not seeing any of
> the logs yet. If you right click on "Web Sites" in inetmgr
> and browse to the ISAPI Filters tab you see two instances
> of IISCrashAgent - priority HGH , but the executable
> location is \\?\C:...\IISCHAgent.dll. Should I remove the
> other entry and then edit the remaining one remapping the
> location of the dll? I noticed also that I have random
> number of instances of _IISCHAgent.exe in taskmgr. I
> assumed this was for each instance of w3wp.exe. If you
> rclick on the individual websites and browse to the ISAPI
> tab i do not show anything in the Filter Names. Im
> thinking you will have to add the dll entry in each
> website you want to monitor. I could be way off on this
> though. So basically my action plan on this is to
> a. Remove the duplicated entry on the isapi tab
> of "Web Site Properties"
> b. Remap the location of the IISCHAgent.dll to
> remove the \\?\ from the path (I have no idea where that
> came from by doing a default install of the debugg tools)
> c. Map the dll in the ISAPI filter of each website
> I want to monitor
>
> IISCHAgent.ini
> [HangAgent]
> Enable=1
> LogLocation=%SystemDrive%\iisdebugtools\logs
> MaxLogFiles=10
> WriteLog=1
> RequestTimeLimit=4800
> ActionCommand=c:\iisdebugtools\iisdump.exe -o
> c:\iisdebugtools\logs
> MaxActionsAllowed=1
>
> When i do get a log I just hope I can interpret them to
> attempt to diagnose the issue :/
>
> 2. I noticed in perfmon that I have a tremendous amount
> more "sessions timed out" than what i did running iis5 on
> 2k. The connection time out is set for 900 sec
>
> the same as in iis5. In the %windir%\system32
> \lofiles\HTTPERR dir i have a number of these entries in
> the logs
>
> HTTP/1.1 GET /application/dirname/whatever.asp?
> ReportTitle=Daily%20%20Report - 12345678 Connection_Dropped
> or
> 2004-07-03 17:27:58 remote_ip 1550 server_ip 80 - - - - -
> Timer_ConnectionIdle
>
> My question is for an in-house application with a very
> beefy box as host what is the best way to handle this. Our
> users basically connect and work from this
>
> application all day. I'm not sure if having the
> connections disconnect would impact performance in anyway
> or if that is in fact helping. Their sessions time-outs
> are 60 min hardcoded into the asp and also set in the
> individual web site properties. Is it best to continue to
> disconnecting these connections and I'm assuming they just
> initiate another when navigating the application once
> again.? Should I bump these numbers up?
>
> 3. Our asp pages are querying a sql2000 db. They sometimes
> return data to the clients browsers with near 40-60meg
> worth of content.(not my choice) I think its
>
> a bit much and actually had to bump up the asp buffering
> limit to get the pages to even display. I have noticed
> that these types of pages are usually what stops
>
> responding first before i lose the site. Sometimes iis
> will just not return "bigger pages" but will still serve
> smaller asp pages. Is there some type of counters I
>
> should be looking at for some type of memory or caching
> issue. When the system hangs I always have about 0-10%
> load on the cpu which is normal even during
>
> peak hours and usally about 500mb free of 1gig total
> memory for the system. I'm just not seeing any hardware
> related issue on this one since the systems are
> underutilized.(I read your web server should be at about
> 40-60% load or you need to bump the thread count up, but
> I'm afraid this will make our problem worse)
>
> 4. I did have a job to restart IIS late sunday nights. As
> i said ealrier we removed the page auditing and created
> the seperate application pools so that the restart job has
> since been removed. I did however set the worker processes
> to recycle at a specific time once every 24 hours. I.E.
> Website 1 at 2:30am, website2 at 2:35am and so on. Is this
> the best practice? I think the default was something like
> 29 hours or something but I was afraid after some time
> that would make the 29th hour eventually come up in the
> middle of the day. I'm not sure how session state would be
> affected by the recycle and how that would be handled
> within our application.
>
> I appreciate any help/advice in this matter
> Thx in advance
>
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