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rp8400 CPUs

 
Marco Di Ianni
Frequent Advisor

rp8400 CPUs

Hì.

I've two rp8400 for 4 partitions.
Every partition have 4 processors.
I want to deactivate one processor for partition.
ICod command don't work, this is the outputs of commands:

#icod_stat
...
...
...
Local Hard Partition Information
--------------------------------
Total processors: 4
Active processors: 4

Global iCOD Information
-----------------------
iCOD cells: 0
iCOD processors: 0
iCOD Memory: 0.0 GB


And ,

#icod_modify -d 1
NOTE: This complex does not contain iCOD components. Refer to the icod(5)
manpage for more information about iCOD.

Can I deactivate CPU only by PDC (MA - CO - CPU )then reboot??

Can someone help me
12 REPLIES 12
Stefan Stechemesser
Honored Contributor

Re: rp8400 CPUs

icod commands can only be used if you purchased iCOD CPUs (with an icod licence).
If you simply want to deconfigure a CPU, you do not need the icod stuff.
Reboot the partition and stopp the boot process to get to the BCH menu. Enter the Service menu and deconfigure the CPU with the "cpu" command. For example "cpu 1 off" to disable CPU #1. Then enter "reset" and after the reset, the CPU is deconfigured.

Best regards

Stefan
Jeff Schussele
Honored Contributor

Re: rp8400 CPUs

Hi Marco,

I can confirm Stefan's reply. One does indeed need the purchased iCOD product to do the dynamic CPU allocation/deallocation. I ran into the same thing & let HP know that they need to remove all documentation that states that iCOD is free. It's simply not true anymore.

And I want to clarify one thing in the procedure Stefan states in the deallocation from the BCH. Cell based systems need the cell # *and* the CPU # in the command. So for the 4th processor on the cell 0 board the command would be:
cpu 0 3 off
2nd CPU on cell 1 would be:
cpu 1 1 off
You generally want to deallocate the highest numbered CPU in the cell first & so forth.

HTH,
Jeff
PERSEVERANCE -- Remember, whatever does not kill you only makes you stronger!
Marco Di Ianni
Frequent Advisor

Re: rp8400 CPUs

And (for confirm) if I want re-enable the disabled CPU, the sequence is the same?!

Jeff Schussele
Honored Contributor

Re: rp8400 CPUs

Yep - just change on for off - EX:

cpu 0 3 on

Rgds,
Jeff
PERSEVERANCE -- Remember, whatever does not kill you only makes you stronger!
Charlie_17
Advisor

Re: rp8400 CPUs

For confirm:
Yes, the procedure is the same, just "on" instead of "off" obviously :-)

Charlie
Time flies like an arrow -- fruit flies like a banana
Marco Di Ianni
Frequent Advisor

Re: rp8400 CPUs

'My' server are already working.
And I must deactivate a processor for partition.....Is it dangerous for OS and all applications that running on?!
Must I do others operation (on OS) after the servers boot?!

Marco Di Ianni
Frequent Advisor

Re: rp8400 CPUs

For single rp8400, must I reboot every partition?! Or I can reboot only one for deactivate a cpu for partition?!?
Otherwise, why must I specify the cell in the CPU command?!

Thanks to all!!
Stefan Stechemesser
Honored Contributor

Re: rp8400 CPUs

>Is it dangerous for OS and all applications that running on?!

No. The Firmware prevents you from deactivation needed CPUs (1 CPU/Cell needed to run firmware code and OS).

>Must I do others operation (on OS) after the servers boot?!

No.

>For single rp8400, must I reboot every partition?!

No, only the partition you want to deconfigure a CPU needs a reboot.

>Or I can reboot only one for deactivate a cpu for partition?!?

yes

>Otherwise, why must I specify the cell in the CPU command?!

because the CPU command was designed to deconfigure dedicated CPUs, f.e. for troubleshooting purposes. => You must choose a dedicated CPU on a dedicated cell.

By the way, this leads to the question: Why do you want to deactivate a CPU ? Testing or troubleshooting ?

I hope, this answers your questions.

Best regards

Stefan
Stefan Stechemesser
Honored Contributor

Re: rp8400 CPUs

There is one thing I forgot:

There is a way to ONLINE deactivate CPU's with the online diagnostics expert tool, but this tool is password protected and can only be used by HP support. If you have a contract, contact your HP support, maybe they are able to help you, if you only want to make some performance tests.

best reagrds

Stefan

Marco Di Ianni
Frequent Advisor

Re: rp8400 CPUs

>>For single rp8400, must I reboot every partition?!

>No, only the partition you want to deconfigure a CPU needs a reboot.

>>Or I can reboot only one for deactivate a cpu for partition?!?

>yes

I've not clear this!!
I repeat (maybe my english is not 'perfect'! ;-) ):

If I've a rp8400 with 2 partitions and I must deconfigure 1 CPU for partitions (then, in total 2 CPUs), must I reboot every 2 partitions?! Or can I reboot a single partition and by a BCH deconfigure 1 CPU for partitions?!

Grazie!

Re: rp8400 CPUs

Hi Marco

If you wish to de-install one cpu in one partition, that partition will have to be shut down ad brought back to BCH.

If you plan to do this on both partitions, this can be done as two seperate excersises, they do not have to be done at the same time. Treat each partition as a seperate server.

Please note that if you get the firmware updated - this process will have to be repeated, because the update process involves turning all cpu's back on.

Regards
Customer Engineer
Marco Di Ianni
Frequent Advisor

Re: rp8400 CPUs

Thanks all!!