topic Re: Increase kernel parameter "nfile". in Operating System - HP-UX

Increase kernel parameter "nfile".

UniRock — Tue, 08 Apr 2008 14:08:16 GMT

Hello All,

Below is the output of kmtune (nfile) ;

#kmtune | grep -i nfile
nfile 2910 - (16*(NPROC+16+MAXUSERS)/10+32+2*(NPTY+NSTRPTY+NSTRTEL))

I have to increase the nfile size from 2910 (existing) to about 5000,
but the problem is it has such a lenghty formula, can I override the formula by numerical value or is it necessary to go according to the formula and change all other variables?

Please help.

Thnx..

Re: Increase kernel parameter "nfile".

James R. Ferguson — Tue, 08 Apr 2008 14:14:37 GMT

Hi:

Simply choose an appropriate value and ignore the (deprecated) formula. You can choose an ample value for your needs since the number represents elements in a kernel table. The memory required is very small.

Regards!

...JRF...

Re: Increase kernel parameter "nfile".

Yashwant — Tue, 08 Apr 2008 14:19:26 GMT

#kmtune -s nfile=
#cd /stand/build
#mk_kernel
#mv vmunix_test /stand/vmunix
#reboot
will change the nfile to new value.

make sure you have the copy of present kernel(vmunix) before doing this exercise, so that you can recover even if the system fails while booting with new value of nfile.

Re: Increase kernel parameter "nfile".

Javed Khan_1 — Wed, 09 Apr 2008 01:26:24 GMT

Hi,

Since your OS is 11.11 you may use

#kmupdate instead of

#mv vmunix_test /stand/vmunix

and reboot this will schedule new kernel move during next reboot .

Re: Increase kernel parameter "nfile".

Dennis Handly — Wed, 09 Apr 2008 05:45:43 GMT

You can of course use SAM to change the value. It may have better help on what's allowed for nfile.