Sorry, 10.2.0.4. We have AIO-MAX-NR=3145728 but the messages are still there. _____ De: Mohammad Rafiq [mailto:rafiq9857@xxxxxxxxxxx] Enviado el: sábado, 27 de noviembre de 2010 17:27 Para: Juan Cruz Miranda Vigo; przemolicc@xxxxxxxxx; oracle list Asunto: RE: direct IO You did not mention oracle version. Try to get it set aio-max-nr to 1048576 (default is 65536). If it is 10.2.0.5 then it must be 1048576 as a work around. Regards Rafiq > From: jcmiranda@xxxxxxxxx > To: przemolicc@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx > Date: Fri, 26 Nov 2010 12:58:22 +0100 > Subject: RE: direct IO > > > We are getting > > WARNING:io_submit failed due to kernel limitations MAXAIO for process=128 pending aio=110 > WARNING:asynch I/O kernel limits is set at AIO-MAX-NR=3145728 AIO-NR=77074 > WARNING:Oracle process running out of OS kernel I/O resources (1) > WARNING:Oracle process running out of OS kernel I/O resources (1) > WARNING:Oracle process running out of OS kernel I/O resources (1) > > on several systems with linux pppc64 and it seems there are no patch for this error on this platform. > I can´t tell if direct i/o is slower. > > Anyone know how to solve this problem? > > ________________________________________ > De: oracle-l-bounce@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx] En nombre de przemolicc@xxxxxxxxx [przemolicc@xxxxxxxxx] > Enviado el: viernes, 26 de noviembre de 2010 10:21 > Para: oracle-l@xxxxxxxxxxxxx > Asunto: Re: direct IO > > On Thu, Nov 25, 2010 at 05:32:02PM +0200, Laimutis.Nedzinskas@xxxxxx wrote: > > Looking for experiences/advices of others regarding one issue with direct > > IO. > > > > Recently we switched to another data center and some databases reported > > increased IO time. > > After investigating we found that IO is slower on file systems (Veritas, > > Solaris 10) mounted with direct io options. > > AWR shows more time on scattered reads but for the same number of blocks > > too. > > We are going to switch of direct IO and test but for the time beeing I am > > wandering why direct IO is bad in our case. > > > > We've got seriously increased times for statistics gathering which does > > full scan naturally - we've found 2 full scan sqls on the same table > > clearly comming from dbms_stats package . Full scan is not cached by > > oracle. But file system cache can help in that particular case. > > Do you have exactly the same storage configuration in both data centers ? > > We found that _usually_ switching from buffered filesystem to direct IO won't > help unless you increase also Oracle buffers (so Oracle uses memory which > had been used previously for filesystem buffering). > Also on Veritas/UFS I recommend to turn on direct IO in Oracle (FILESYSTEMIO_OPTIONS=SETALL) > and not in Veritas (we don't set any mount options in /etc/vfstab for Veritas filesystems). > > If you bought Veritas ODM - just use it. > > Regards > Przemyslaw Bak (przemol) > -- > http://przemol.blogspot.com/ > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ---------------------------------------------------------------------- > Najlepsza wyszukiwarka tanich lotĂłw! > SprawdĹź >>> http://linkint.pl/f284a > > -- > //www.freelists.org/webpage/oracle-l-- > //www.freelists.org/webpage/oracle-l > > =