Read/Write to a physical file in a web farm?

[Feng Chun]

Hi,
need help for this.
In asp.net, when I do a load balancing on my website, which means there are
2 or more servers behind, one of my webpage needs to read/write a temp file
in the server. But the client's first request may go to the first server,
but the second request goes to the second server, so there is a chance that
the request could not find the correct file to read/write.

how to solve this issue?

Thanks a lot.

Best Regards,
fengchun

 

[Lucas Tam]

how to solve this issue?

Write to a central file sever or file share?

 

[Guest]

You can take the example of Brinkster web hosting. All files are located in a
centralized location.

You may of course, need to have the FilePaths etc in the Web.config or the
related configuration files.

Did this attend to your query?

 

[Steven Cheng[MSFT]]

Hi Feng,

Since File system it self is not server transparent so directly read/write
file in asp.net web application will cause problems in loading balance
enviornment. Generally, we would suggest avoid such temp file processing.
If it is really necessary to do so, I think you can consider Lucas's
suggestion on make temp dir in a shared public place. Also, you can make
check when accessing the temp file, if not exist recreate it again.

Thanks,

Steven Cheng
Microsoft Online Support

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| > how to solve this issue?
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| Write to a central file sever or file share?
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[John Timney \(ASP.NET MVP\)]

You could think about trying to use sticky sessions, its usually a feature
of network load balancing - search google for Single Affinity load
balancing.

You can read a little about it here then ask your network admin to help you
enable it if its what your looking for.

http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/clustering/nlbfaq.mspx

--
Regards

John Timney
ASP.NET MVP
Microsoft Regional Director