Re: JFS2 on AIX on IDS
Fernando, Couldn't they take advantage of CIO, eve in IDS 9 or 10, by mounting the entire filesystem that contains the chunks (or mounting the directory containing the chunk files as an independently mounted sub-directory) with CIO enabled at mount time? Art Art S. Kagel Oninit (www.oninit.com) IIUG Board of Directors (art@iiug.org) Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Oninit, the IIUG, nor any other organization with which I am associated either explicitly or implicitly. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves. On Mon, May 11, 2009 at 7:36 PM, Fernando Nunes <domusonline@gmail.com>wrote: > LIGHT SCANS wrote: > > We have about 100 servers using JFS2 on AIX 5.2 with Informix > > (versions 9 and 10). And yes folks, we are in the process of > > upgrading them to AIX 6.1 and Informix 11.5. Anyway, we saw no > > difference in Informix's performance when we started using JFS2. A > > few years ago we saw: > > > > > https://www-03.ibm.com/systems/resources/systems_p_os_aix_whitepapers_db_perf_aix.pdf > > > > and were excited to get the performance Oracle got, but alas, to no > > avail. But our system administrators had their reasons so we are > > still glad to be "up to date". > > > > -L.S. > > _______________________________________________ > > Informix-list mailing list > > Informix-list@iiug.org > > http://www.iiug.org/mailman/listinfo/informix-list > > > IDS 9 and 10 don't even support DIRECT_IO. > You will probably see improvements once you go to IDS 11.5. > Remember that if you want to use CIO you must go to IDS 11.50.FC4... > Of course this is a pretty new version... Careful testing is recommended > as always. > > Regards. > _______________________________________________ > Informix-list mailing list > Informix-list@iiug.org > http://www.iiug.org/mailman/listinfo/informix-list >
Art Kagel wrote: > Fernando, > > Couldn't they take advantage of CIO, eve in IDS 9 or 10, by mounting the > entire filesystem that contains the chunks (or mounting the directory > containing the chunk files as an independently mounted sub-directory) > with CIO enabled at mount time? > > Art > Very good question. I believe they shouldn't... If you activate CIO you're assuming the engine and the tools are ready for it... The OS will not lock the files, so it's up to the engine and it's tools to do things properly. I wouldn't risk it, but I don't have enough knowledge to know what (if any) could happen. Regards > Art S. Kagel > Oninit (www.oninit.com <http://www.oninit.com>) > IIUG Board of Directors (art@iiug.org <mailto:art@iiug.org>) > > Disclaimer: Please keep in mind that my own opinions are my own opinions > and do not reflect on my employer, Oninit, the IIUG, nor any other > organization with which I am associated either explicitly or implicitly. > Neither do those opinions reflect those of other individuals affiliated > with any entity with which I am affiliated nor those of the entities > themselves. > > > > On Mon, May 11, 2009 at 7:36 PM, Fernando Nunes <domusonline@gmail.com > <mailto:domusonline@gmail.com>> wrote: > > LIGHT SCANS wrote: > > We have about 100 servers using JFS2 on AIX 5.2 with Informix > > (versions 9 and 10). And yes folks, we are in the process of > > upgrading them to AIX 6.1 and Informix 11.5. Anyway, we saw no > > difference in Informix's performance when we started using JFS2. A > > few years ago we saw: > > > > > https://www-03.ibm.com/systems/resources/systems_p_os_aix_whitepapers_db_perf_aix.pdf > > > > and were excited to get the performance Oracle got, but alas, to no > > avail. But our system administrators had their reasons so we are > > still glad to be "up to date". > > > > -L.S. > > _______________________________________________ > > Informix-list mailing list > > Informix-list@iiug.org <mailto:Informix-list@iiug.org> > > http://www.iiug.org/mailman/listinfo/informix-list > > > IDS 9 and 10 don't even support DIRECT_IO. > You will probably see improvements once you go to IDS 11.5. > Remember that if you want to use CIO you must go to IDS 11.50.FC4... > Of course this is a pretty new version... Careful testing is recommended > as always. > > Regards. > _______________________________________________ > Informix-list mailing list > Informix-list@iiug.org <mailto:Informix-list@iiug.org> > http://www.iiug.org/mailman/listinfo/informix-list > > -- Fernando Nunes Portugal http://informix-technology.blogspot.com My email works... but I don't check it frequently...