Re: /3GB /PAE switches; 10GB RAM windows 2003; informix 10

"Name withheld by request" <anonb6e9@nyx3.nyx.net> wrote in message news:1232573075.413133@irys.nyx.net... > We're setting up an (SCM) application that uses Informix 10; > both on a new (yet to be spec'd out) Windows 2003 enterprise server box. > > The current production box has 10GB RAM, 4 CPUs, and a 2046MB paging file. > > Currently the boot.ini has the '/PAE' switch in place, but > not the '/3GB' switch. Would it be better to have > both /PAE and /3GB? > > Is our page file big enough? > > Is informix able to take advantage of the '/PAE' switch? > This may or may not require that Informix know about the > AWE api (pls let me know). > > Our application vendor asked that the RESIDENT flag be > set to 1. oninit shows ~900,000K in use. > > -- > thank you I read the 32bit enterprise edition of server 2003 could address up to 32Gb of RAM if the PAE switch is used? (memory limits: http://msdn.microsoft.com/en-us/library/aa366778.aspx ) But the application has to be aware of how to use it - something about 'largeaddressaware' flag when compiled... not sure where ids stands on this. IDS 11.5 plays a lot nicer with windows when using large memory (however I only have experience with up to 4GB on standard edition) - one feature particularly nice is the onconfig parameter SHMNOACCESS - in case Microsoft release a patch that puts a system dll in the way of the memory your database is trying to use, with this you can stop ids trying to use this piece of memory until Microsoft releases a hotfix - 'hnetcfg.dll' seems to be the only dll at the moment (service pack 2) still turning up in a bad location (hotfix article KB948656). The /3GB flag just increases the user space by an extra gigabyte, but if ids can address all that extra memory above 4GB then it probably could be left out, as using it does reduce some kernel space for things like NonPaged pool and system PTE's. If it does turn out IDS is limited to the 4GB then using the /3GB flag gives you about 2.7GB memory for IDS. If running only IDS on this machine then a paging file of 2046MB is probably fine - our production server is set higher but it barely touches the page file anyway. Regards, Bryce Stenberg.