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From:Markus Hermeskeil Döhr Date:February 24 2003 7:55pm
Subject:RE: raw devices & async i/o
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It does both...

the parameter _IOPROCS_SWITCH handles the "number" of I/Os after the
second/n'th thread gets the work to write to the harddisk. So if there's low
I/O it's indeed serialized, if one thread is too busy or the number of
concurrent I/Os is higher than _IOPROCS_SWITCH && _IOPROCS_PER_DEV is > 1
then it's executed in parallel. 

-- 
Markus Doehr            	     SIEGENIA-AUBI KG
CCC - SAP R/3 Basis, SAPDB-DBA     Zum Grafenwald
fon: +49 6503 917 152              D-54411 Hermeskeil
fax: +49 6503 917 190              http://www.siegenia-aubi.com
Thread
• Is the Log writer lazy by default?Tobias Oberstein22 Feb
  • Re: Is the Log writer lazy by default?Sven Köhler22 Feb
  • raw devices & async i/oArne Gehlhaar24 Feb
    • Re: raw devices & async i/oSven Köhler24 Feb
  • Re: Is the Log writer lazy by default?(Hauke Fath)25 Feb
• RE: Is the Log writer lazy by default?Martin Brunzema24 Feb
• RE: raw devices & async i/oMarkus Hermeskeil Döhr24 Feb
  • Re: raw devices & async i/oSven Köhler24 Feb
• RE: raw devices & async i/oMarkus Hermeskeil Döhr24 Feb
  • Re: raw devices & async i/oSven Köhler24 Feb
• RE: raw devices & async i/oMarkus Hermeskeil Döhr24 Feb
  • Re: raw devices & async i/oArne Gehlhaar26 Feb
• RE: Is the Log writer lazy by default?Tobias Oberstein28 Feb
• RE: Is the Log writer lazy by default?Tobias Oberstein28 Feb
  • Re: Is the Log writer lazy by default?(Hauke Fath)28 Feb
• RE: Is the Log writer lazy by default?Martin Brunzema10 Mar