Read Block Size on Disk

Posted in 2005

gerd kaluzinski — Tue, 25 Oct 2005 13:06:47 — source: IIUG Forums & Mailing Lists

Hi all, what block size is used when informix is reading from disks ? Is there a difference between the block size on solaris and linux ? thanks gerd ______________________________________________________________ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193

↪ replying to gerd kaluzinski

Jonathan Leffler — Tue, 01 Nov 2005 07:39:58 — source: IIUG Forums & Mailing Lists

On 10/25/05, gerd kaluzi.... <gerd.kaluzinski@web.de> wrote: > what block size is used when informix is reading from disks ? > Is there a difference between the block size on solaris and linux ? Solaris and Linux are both 2K page ports. Basically, IDS reads in the pages... If you've got configurable pages, you get bigger blocks read. -- Jonathan Leffler #include <disclaimer.h> Email: jleffler@earthlink.net, jleffler@us.ibm.com Guardian of DBD::Informix v2005.02 -- http://dbi.perl.org/

↪ replying to Jonathan Leffler

Madison Pruet — Tue, 01 Nov 2005 16:39:51 — source: IIUG Forums & Mailing Lists

That's true, but... The IO complex will dynamically merge IO blocks into bigger blocks when IO occurs on near pages. We see what IO request is pending and will combine them if we can. This kicks in mainly during checkpoints, when doing log buffer writes, when doing scan reads, or when doing IO to large objects. I think the max size is 64K. M.P. "Jonathan Le...." <jleffler.iiug@gm ail.com> To Sent by: ids@iiug.org forum.subscriber@ cc iiug.org Subject Re: Read Block Size on Disk [5944] 11/01/2005 01:40 AM On 10/25/05, gerd kaluzi.... <gerd.kaluzinski@web.de> wrote: > what block size is used when informix is reading from disks ? > Is there a difference between the block size on solaris and linux ? Solaris and Linux are both 2K page ports. Basically, IDS reads in the pages... If you've got configurable pages, you get bigger blocks read. -- Jonathan Leffler #include <disclaimer.h> Email: jleffler@earthlink.net, jleffler@us.ibm.com Guardian of DBD::Informix v2005.02 -- http://dbi.perl.org/ [demime 1.01d removed an attachment of type image/gif which had a name of graycol.gif] [demime 1.01d removed an attachment of type image/gif which had a name of pic14879.gif] [demime 1.01d removed an attachment of type image/gif which had a name of ecblank.gif]