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From Pier Fumagalli <p...@betaversion.org>
Subject Re: curious write-requests
Date Fri, 14 Oct 2005 09:09:01 GMT
On 14 Oct 2005, at 09:04, Nathanael D. Noblet wrote:
> On Fri, 2005-10-14 at 09:01 +0200, andreas.konrad@arcor.de wrote:
>
>> Hello,
>>
>> we have an extra partition (ReiserFS) for the htdocs directory of  
>> our apache 1.3.28 (SuSE 9.0).
>> For performance issues we have monitored our webserver with the  
>> tool "iostat" and recognized many write-requests on the htdocs- 
>> partition.
>>
>> Can anyone explain to me where this write-requests do come from?  
>> Who is writing and what/why?
>>
>> In a test we requested only static html-pages which can't write  
>> temporary files. Nevertheless we had this write-requests.
>>
>
> Just a guess but perhaps updating the atime or something like that
> (last-accessed) time of the file? I know I saw awhile ago a document
> saying to increase performance to mount noatime on filesystems for
> web/file serving...

We had the same issue a year-or-so ago on one of our Gentoo/Linux  
boxes running ReiserFS. Mounting the partition with the "noatime"  
option fixed it in our case.

     Pier


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