IIs logfiles and network bandwidth

Posted on 2008-11-11
Last Modified: 2012-05-05
I seem to be running into some network bandwidth / bottleneck  issues that may have to do with IIS log files.  Right now we have several websites writing their logfiles in W3C extended log format and sending them to a device called Drobo.  The Drobo device seems to be slowing down when browsing through it.  Does anyone know the advantages and disadvantages to setting the frequency of log time periods in IIS?

Right now ours are set to daily for every site.  Would changing this setting to hourly allow for more network bandwidth?
Question by:bkort1
    LVL 57

    Expert Comment

    Which Drobo product are you using?

    What type of drives are in it?

    What is the connectivity between the Drobo and the web server?

    How many is "several" web sites?

    How many total hits per second are you getting on all of the web sites combined?

    Author Comment

    Well first of all, despite any of the questions asked, would hourly logging allow for a more consistent use of bandwidth instead of daily which might be sending a huge chunk of data at once?
    LVL 57

    Accepted Solution

    Well, it depends.  For doing the actual logging (from the IIS server to the Drobo device) it does not matter if it is daily or hourly.

    Now, for scanning the logs (from the Drobo device to some other computer) it would make a big difference.  Say you average 100MB of log data per hour.  If you have daily logs, then when you need to look at the logs you need to transfer 2.4GB of data in one shot, whereas if you have hourly logs you only need to transfer 100MB in a single shot, you would just need to have 24 shots.

    The difference between hourly and daily is what you are using the logs for.  If you want to see when a single specific event occurred, using hourly you could end up reading less data.  However, if you want to see all events then you are still going to read the same amount of data, its just you would read 24 small files vs. 1 big file.  Same volume of data, same amount of bandwidth needed.

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