Shared memory limits in HP/UX 10.20

What are limits in 10.20 ?. Kernel parameter SHMMAX's maximum is limited to 1g. We have three instances (7.23 UC6) with 260 concurrent Baan users. I've seen a note for a limit of 1,7 g for all instances together. Is that true ?. We have 2,5 total memory now and i've not been able to assign more than 1,7 g. I'm just thinking to install more memory but i'm not sure does it give more memory for db's att all !. -Jukka

Jukka, to use more than 1.75GB of shared memory on HP-UX 10.20 some HP patch has to be installed. HP should be able to help out with the current id of the patch required. To use more than 1.75GB shared memory with Informix you have to 'chatr' all executables that attach to shared memory (onstat, ontape, ...). See the man pages for chatr. Please note that onbar cannot be chatr'ed with IDS versions earlier than 7.24.UC5 and therefore onbar won't be able to attach to shared memory if shared memory is created by a chatr'ed oninit. To improve performance you might also try to do 'chatr +pd64M $INFORMIXDIR/bin/oninit' to increase shared memory page size. That should make a noticable performance difference for instances with larger shared memory segments. Hope that helps, Heiko ===== all standard disclaimers apply ===== "J. Mäki" wrote: > What are limits in 10.20 ?. Kernel parameter SHMMAX's maximum is limited to > 1g. We have three instances (7.23 UC6) with 260 concurrent Baan users. I've > seen a note for a limit of 1,7 g for all instances together. Is that true ?. > We have 2,5 total memory now and i've not been able to assign more than 1,7 > g. I'm just thinking to install more memory but i'm not sure does it give > more memory for db's att all !. > > -Jukka