maximum swap allowable in HPUX 11.00 64 bit

[Jayamohan Damodaran]

We are facing a problem with HPUX 11.00 64 bit. We are not able to increase the
swap more than 5GB.We are having k570 machine with 4 CPUs 3GB RAM. Currently
1GB device swap in vg00, 1GB device swap in vg01 and 3GB filesystem swap is
also configured.System is having Informix 7.31FC4,BaaN, Omniback II loaded.
As per our BaaN consultant, they require a swap space of 2.5 times of RAM.We
are facing some performance problems and we are in a process of sorting out
this and the BaaN suggested this.
When we tried to increase the swap space by adding a HDD,its not allowing to
add more than 5GB swap which is currently configured. We are getting a message
that "maxswapchunks" has to be increased to add more swap. We tried by
increasing the same, but in the very next reboot the machine got crashed. We
resored the old setup. We want to know,
1) What all things we have to take care to increase the swap space to 7.5GB in
this condition ?
2) If the kernel parameters has to be tuned, which all parameters has to be
tuned and what is the formula / relation for that ?
3) Is it recomended to have this much swap space ? Is there any O/S limitation
?
Please help us to sort out this problem..
Thanks..

[Alan Bocutt]

Maximum total swap space is 34GB

Total configurable Swap space is calculated by

MAXSWAPCHUNKS*SWCHUNKS*DEV_BSIZE (1024)

Although the amount of swap space available is determined by the contents of
your fstab file /etc/fstab