psradm

[rgoud]

Hi list,
I need to bring two CPU's offline on the production, do I have to bring it offline
in single user mode?, is it ok to bring the CPU offline in multi user mode using psradm?.

How do I make sure there are no processes are using a certain CPU? I definetely want
to check this before bringing it offline in multi-user and also is there a way
to bring certain CPU's offline automatically when server reboots in inittab?.
Thanks in advance

 

[cndcadams]

rgoud;

what model system is this?

ca

 

[Annihilannic]

You should be able to use psradm to offline CPUs safely at any time. The kernel will handle migration of processes off those CPUs.

You can create a startup script in /etc/init.d/rc2.d containing the commands to offline those CPUs at boot-time. Remember to make it executable.

Annihilannic.

 

[daFranze]

afaik there's no need to shut down to single user, if a process is running on a specific cpu the scheduler will reschedule this process; afaik the psradm is just requesting a shutdown by the kernel, so the first step is to finish the process running on the specific CPU or schedule it to another CPU

# psrinfo
0 on-line since 07/28/2005 12:37:36
1 on-line since 07/28/2005 12:37:37
# psradm -f 1
# psrinfo
0 on-line since 07/28/2005 12:37:36
1 off-line since 01/27/2006 15:12:15
# psradm -n 1
# psrinfo
0 on-line since 07/28/2005 12:37:36
1 on-line since 01/27/2006 15:12:31
# who -r
. run-level 3 Jul 28 12:38 3 0 S
#

if you want to be sure there's no important process running on this CPU write a script /etc/rc1.d/K01stopcpu with the psradm commands inside (remember the chmod 755) and reboot the host to single user mode...

Best Regards, Franz
--
Solaris System Manager from Munich, Germany
I used to work for Sun Microsystems Support (EMEA) for 5 years in the domain of the OS, Backup and Storage

 

[cndcadams]

There are also nvram settings(atleast on a e450) which can be used to keep the cpu slot from being probed which will accomplish what you want.

Why would you not want a cpu used? (this is for my knowledge not to belittle your question. This could be something I may need to know for the future.)

Thanks

CA

 

[Annihilannic]

It makes for any easy upgrade when users start complaining about system performance.

Annihilannic.