Re: Page cleaners

All, I have one question about page cleaners. As they run on CPU VP threads what is the value in having more page cleaners that CPU VP threads? Rgds, Jason In article <35F24445.2AD01F0C@weideneder.de>, Stefan Weideneder <stefan@weideneder.de> wrote: > Hi, > > Normand Bedard wrote: > > = > > > I would like to know if: > > = > > > 1) you assign one page cleaner per disk or one page cleaner per chunk? > > I would assign one page cleaner per disk. But this is only usefull > if you assign your chunks to your dbspaces in the right order and > if you balance your I/O across the disks. > > In my terms a dbspace is a disk. If you have two disks for Informix: > > 1st chunk should reside on the 1st disk. > 2nd chunk should reside on the 2nd disk. > 3rd chunk should reside on the 1st disk. > 4th chunk should reside on the 2nd disk. > > If you are using the classic UNIX I/O: > > NUMAIOVPS=3D2 ( if you run a lot of selects, use NUMAIOVPS=3D3 ) > > If you are using KAIO: > > NUMAIOVPS should be set to 1.> > If you are mirroring both disks by the means of Informix you should > set NUMAIOVPS to 4. ( In this case you have 4 disks ). > > > 2) you have 30 mirrored disks do you assign 30 or 60 page cleaners? > > 30. Page cleaners do not perform any I/O. They are just = > > responsible to transfer modified buffers to the AIO-subsystem. > > = > > > P.S. We are using Informix Dynamic Server Ver. 7.23 on SUN Solaris2.4 > > = > > > -- > > Normand B=E9dard > > Bell Canada > > 671 De La Gaucheti=E8re, B300 > > Montr=E9al, Qu=E9bec H3B-2M8 > > Bye > = > > Stefan Weideneder > > ---------------------------------------------------------------- > ---------------------------------------------------------------- > -----== Posted via Deja News, The Leader in Internet Discussion ==----- http://www.dejanews.com/rg_mkgrp.xp Create Your Own Free Member Forum