topic Re: how can i use command line to config kernel parameter in Operating System - HP-UX

how can i use command line to config kernel parameter

常有慈悲心 — Wed, 15 Dec 2004 19:48:03 GMT

not use sam.

Re: how can i use command line to config kernel parameter

Nguyen Anh Tien — Wed, 15 Dec 2004 20:19:54 GMT

1. Backup current kernel
#cd /stand
#cp system system.bak
#cp vmunix vmunix.bak
2. setting new values:
#/usr/lbin/sysadm/system_prep -s /stand/system
#kmtune -s kernel_parameter=newvalues
for Example
#kmtune -s nproc=2234
3.make new kernel
#mk_kernel -o /stand/vmunix
#kmupdate
4. reboot
#cd /
#shutdown -ry 0

Re: how can i use command line to config kernel parameter

Hoang Chi Cong_1 — Wed, 15 Dec 2004 20:42:18 GMT

Hi China Demo

Strongly recommend: Have to backup the current kernel parameter configuration:
Make a backup of /stand/system, /stand/vmunix and /stand/dlkm in the /stand directory.

Then you can do it follow these steps:

1. login as root user
2. cd /stand/build
3. excute the command :/usr/lbin/sysadm/system_prep -s system_kernel
# vi system_kernel (and add make your changes as you want)
4. save that file

5. Build a bootable HP-UX kernel with command: /usr/sbin/mk_kernel -s system_kernel
6. Update default kernel file and files associated with the kernel or update specified kernel modules with this command: /usr/sbin/kmupdate
7. cd /
8. Reboot the server: shutdown -r -y 0

For more information, you can also refer to the System and network Administrator I document and see on the man page of all command.

Hope this helps
Regard,
Chi Cong

Re: how can i use command line to config kernel parameter

Timothy Chen_1 — Fri, 17 Dec 2004 13:22:45 GMT

Hi, China Demo

In or after HP-UX 11.11, you can run the kmtune command to configure dynamic kernel parameters online:
# /usr/sbin/kmtune -u -s {name{=|+}value}

For example:
# /usr/sbin/kmtune -u -s shmseg=256
or
# /usr/sbin/kmtune -u -s shmseg+50

Then you run this command to query the result:
# /usr/sbin/kmtune -q shmseg

Or refer to the manpage for the details.

Re: how can i use command line to config kernel parameter

Nguyen Anh Tien — Fri, 17 Dec 2004 22:39:59 GMT

Hi China Demo
Why did not you closed this thread when you assign 10 point for us??

Re: how can i use command line to config kernel parameter

Phillip Renner — Sat, 18 Dec 2004 16:47:43 GMT

Just a tip for you all, even when I do manual kernel rebuilds I first change the parameter using sam but I cancel out of sam before I implement the kernel change. Sam will tell you if you're trying to enter a bad kernel parameter. You can unknowningly force bad parameters into the kernel using manual rebuilds.