topic /dev/async io in Operating System - HP-UX

/dev/async io

p7 — Mon, 24 Oct 2005 11:09:21 GMT

hi all

we just installed oracle 10g on an hpux 11.11 server. all went well except oracle keeps generating trace files complaining about "dev/async device doesnt exist".

we never used it previously, we just use standard vxfs filesystem with oracle sga. i thought this would already qualify as async. what is this /dev/async and what would be the consequences if we do use?

thx in advance

Re: /dev/async io

Jean-Luc Oudart — Mon, 24 Oct 2005 11:25:39 GMT

Hi

What is the value of disk_asynch_io in your init.ora file ?

Regards
Jean-Luc

Re: /dev/async io

TwoProc — Mon, 24 Oct 2005 11:37:56 GMT

Well, you're not going to get asynchronous i/o on a vxfs filesystem anyways, you need raw lvols for that.

Re: /dev/async io

Jean-Luc Oudart — Mon, 24 Oct 2005 11:49:49 GMT

async IO not available on fs with HPUX

http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams061.htm#sthref246

Regards
Jean-Luc

Re: /dev/async io

DCE — Mon, 24 Oct 2005 12:04:55 GMT

Here is a thread that will help you understand (and install) async
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=95321

Re: /dev/async io

Patti Johnson — Mon, 24 Oct 2005 12:35:23 GMT

The messages can be ignored, but if you want to get rid of them take a look at metalink note 60692.1.
This was a bug in 8.0 - interesting that its back in 10g.