Read ahead utilization

Posted in 1999

Family Jurkovic — Wed, 06 Oct 1999 12:54:17 -0400 — source: Informix-list mailing list archive (1991-1998)

Hi there, I am wondering if anybody succeeded to get read-ahead utilization around 99% ?! Regardless of setting RA parameters I cannot achieve more that 96-97%. Any ideas? Dragan Jurkovic MRRM (Canada) Inc.

↪ replying to Family Jurkovic

Yuri Dovgart — Thu, 7 Oct 1999 14:38:02 +0300 — source: Informix-list mailing list archive (1991-1998)

Family Jurkovic <jurkovic@netcom.ca> wrote in message news:37FB7EB9.FD262F96@netcom.ca... > Hi there, > > I am wondering if anybody succeeded to get read-ahead utilization > around 99% ?! Regardless of setting RA parameters I cannot achieve more > that 96-97%. Yes, I got the same. I think it's OK if your performance looks good to you. But be care of 'bufwaits' value - increasing RA params has great impact on it. In my environment, for example when RA_PAGES = 32 and RA_THRESHOLD I have 96 % used pages, but with 64 and 60 respectively - 98,2 %. It's a great place for tests :)). ---------------------------------------------------- With best regards, Yuri Dovgart SAP R/3, Informix technical consultant, Senior System Consultant System Architecture and High Availability Systems, 'Telecominvest' company Email y_dovgart@tci.ukrtel.net ICQ 39284285 > Any ideas? > > Dragan Jurkovic > MRRM (Canada) Inc. >