topic Re: Add A Second CPU To A Server in Operating System - Linux

Add A Second CPU To A Server

John CLARK_5 — Wed, 25 May 2005 09:50:05 GMT

Dear friends,

I have a server with one processor,i want to add a second processor.
Is that need a configuration ? or it doesn't need ? : just shudown the server,plug
the processor and start the server ?

Ps : I have Linux Redhat 4 ES.

Thank you in advance for your help.

Best Regards.

Re: Add A Second CPU To A Server

Steven E. Protter — Wed, 25 May 2005 09:53:13 GMT

If you installed the SMP kernel, which you could have done even with 1 CPU you are done.

The second process will be recognized either way, and the OS will probably use it, but for full performance, you need the SMP kernel.

Otherwise, you are right. There is a minimal chance of a kernel panic, but thats not likely.

SEP

Re: Add A Second CPU To A Server

Ross Minkov — Wed, 25 May 2005 10:57:52 GMT

Also make sure that you have the smp kernel as you default kernel in grub.conf, so when you reboot the server boots to it.

Re: Add A Second CPU To A Server

John CLARK_5 — Wed, 25 May 2005 11:18:58 GMT

you mean that i must choose the line with "smp" ?

Regards.

Re: Add A Second CPU To A Server

Steven E. Protter — Wed, 25 May 2005 11:21:01 GMT

Yes, you are correct, pick the line with smp, if it exists.

If the system runs properly, you can change the grub.conf file to boot off the smp kernel.

SEP

Re: Add A Second CPU To A Server

Ross Minkov — Wed, 25 May 2005 11:23:44 GMT

In your /boot/grub/grub.conf file you will have a line like ths:

default=x

and below it you will have one or more sections like this:

title ...
root (...)
kernel ...
initrd ...

The first section is number 0, the second one is 1, etc. Make sure that the section that has the SMP kernel is you default. So if the first section has the smp kernel then make sure that you have default=0.

HTH,
Ross

Re: Add A Second CPU To A Server

Suraj Singh_1 — Thu, 26 May 2005 02:43:00 GMT

The 2nd processor you are going to add must be of the same specs as the already installed one.

SMP kernel must be enabled if you have more than one processor. Most probably, even if you have one processor, and have HT enabled on it, your systems would by default install both SMP and Non SMP kernels.

Regards