Re: [tlug] Disk I/O bottleneck: how to solve?

["Jean-Christian Imbeault" <jean_christian@example.com>]

>From: David Beutel <david_beutel2@example.com>
>
>I'm sure it's possible to tell Linux to use bigger
>disk buffers.  Sorry, but I don't know how off-hand;

I'm pretty sure there must be some way but I haven't been able to find it 
yet. I was hoping someone on the list might know. Will do more googling. 
Must be using the wrong keywords ...

>By the way, if you didn't have 200M of free RAM, the
>Disk I/O bottleneck might have been coming from
>thrashing

I don't think there is any thrashing going on. It's a web server and I think 
there just are too many requests coming in. That and the fact that apache 
writes 1Gb logs each day. (And yes I do need all the info the 1Gb log, so no 
I can't turn off logging).

>Also, a bigger disk buffer won't help much for
>high-reliability processes that want the kernel to
>guarantee that it's actually finished writing to the
>disk

Very true. But the only writing going on is Apache and it's logs ;)

Gotta find how to make the kernel use a bigger disk buffer.

Jc

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