Re: OOOOPSS: switch from file system to raw device

"koert54" <koert54_at_nospam.com> wrote in message news:<LhV2d.1572538$y4.272781_at_news.easynews.com>...
> So far I have only read the thread with half an eye ...

It helps if you use both eyes...

> I have been using AIX for many years - and also in combination with raw
> devices/oracle

Ditto.

> From AIX 5.2 I only use JFS2 with the CIO mount option (concurrent IO). This
> basically gives
> you raw device performance - file system cache is bypassed, thus less cpu
> spend ...

File system cache is bypassed with direct io (dio). As well as cio. There is a lot more to cio than just bypassing the system cache, as the whitepaper explains.

> IBM has written a whitepaper about it(Oracle 9i on AIX5L) - If you want I
> can email it to you.

That is a very good paper. I know exactly which one you're talking about. But it's not just cio. As the paper says, there is also a correct config for asynch io to be considered. And a few other details.

The OP will for sure enjoy a read of that, bt it's advisable to get all the details implemented. Not just "-o cio" just because the paper says it's good. Received on Sun Sep 19 2004 - 09:50:18 CDT