> I've read on ixora.com.au and other sites that the optimal block size for > AIX is 4K, because JFS pages are 4K also.
Isn't JFS block size changeable? > > Has anyone of you ever experienced performance problems on AIX due to a > larger blocksize? What exactly are the 'read ahead' issues and cpu problems > regarding double buffering etc. Are there any alternatives, other than > moving to raw volumes? I think read ahead problems on 4k file system with 8k block size might mean that some operating systems will do readahead caching when they see more than one consecutive block requested from file system. So, every oracle single-block read will actually result in much larger read by OS. This isn't that bad when Oracle itself is doing big multiblock reads, but for single block reads it might cause performance problems. Tanel. > > HTH, > Hans > > _________________________________________________________________ > MSN Zoeken, voor duidelijke zoekresultaten! http://search.msn.nl > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Hans de Git > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Tanel Poder INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
