Sun Fire V480 Server
 
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Applies to:

Goal

This document describes how to use the commands 'asr-enable' and 'asr-disable' to manually disable CPUs on a Sun Fire V480/V880 V490/V890. This document also provides examples of the steps necessary to implement these ASR commands for single and multiple CPUs.

Solution

The user level commands asr-enable and asr-disable can be used to manually enable or disable system devices. To view the full list of devices that can be enabled or disabled, type the .asr command at the ok prompt. Below is an example of the asr-enable command for a V480.

Note on the Output from Vx90
======================
Be aware that the devices are changed and replaced by "cmp" instead of "cpu".   
Example:   cpu3-bank3 = cmp3-bank3

Also note that disabling a CPU will disable the memory controlled by that CPU.

See : 1370243.1 CPU / Memory Dimm Map 480/490/880/890  for a more complete discussion of CPU numbering and the specific command to disable a particular bank of DIMMs.

The .asr is another user-level command, that will display the current status (enabled or disabled) of devices that are supported by ASR (the example output is from a V480):

{0} ok .asr


ASR Disablement Status


Component: Status

CPU/Memory: Enabled
IO-Bridge5: Enabled
IO-Bridge8: Enabled
IO-Bridge9: Enabled
GPTwo Slots: Enabled
Onboard FCAL: Enabled
Onboard Net1: Enabled
Onboard Net0: Enabled
Onboard IDE: Enabled
PCI Slots: Enabled

The normal ASR function is that disabling a CPU with asr-disable will effectively disable the entire CPU module, so disabling CPU1 will also take CPU3 out of the system. To bring a CPU back on line after it has been disabled, you must asr-enable the CPU and then power-cycle the system using the front power button.

Similarly, if you have CPU1 & CPU3 disabled,then enable only CPU1 still leaving CPU3 disabled.  CPU1 will still be [effectively] disabled as well, so you must enable both CPUs (and power-cycle) before either CPU is available. Simply running asr-enable on a cpu and reseting the system isn't good enough, you must power-cycle using the front power button.

You need to use the .asr command at the ok prompt to check the status of each CPU.

Here are some examples (based on 4-way V480 server) of the steps you need to follow in order get a CPU(s) back online after it has been disabled:

1. Example procedure to asr-disable and asr-enable single CPU (4-way system) :

The steps to asr-enable a previously asr-disable CPU.  This is not needed if the CPU was failed by POST, this is only needed when the CPU has been manually disabled:

a)   For a V480

ok asr-disable cpu1

- or  for V490-

a1)

Then

b)  Reset the system.   POST will display Disabled and unavailable components:

ok reset-all

Resetting ...

WARNING: Offlining/Disabling CPU1...and CPU3...Done.

c) At this point if reset-all is performed (or reset-all followed by power cycle using the front power button) CPU1 will still be unavailable. This can be verified via .env command at the ok prompt, which will show the status only for CPU0&2, or at the OS level by using the commands psrinfo -v and prtdiag -v.

d)  To enable CPU1/CMP1 for V480

ok asr-enable cpu1

d1) For V490:

ok asr-enable cmp1

.asr  can be used to check status. After a  reset-all  cpu1/cmp1  is still unavailable.  This can be verified by using .env, which will only show the status for CPU0 & CPU2.

After a power-cycle using the front power button cpu1 & cpu3 will now be available.  This can be verified via the .env command  at OBP level, which will now show the status for all 4 CPUs, or at the OS level by using the commands  psrinfo -v and prtdiag -v.

2. Example procedure to asr-disable and asr-enable CPU1 & CPU3 (4-way system):

To bring back CPU1 and CPU3 both CPU's need to be enabled (if only CPU1 is enabled, after reset-all the system will again offline (effectively disable) both CPU1 and CPU3):

ok asr-enable cpu1 (V480)
ok asr-enable cpu3 (V480)
ok asr-enable cmp1 (V490)
ok asr-enable cmp3 (v490)
ok reset-all


ok .asr (to check ASR Disablement Status)

Component: Status
CPU/Memory: Enabled
IO-Bridge5: Enabled
IO-Bridge8: Enabled
IO-Bridge9: Enabled
GPTwo Slots: Enabled
Onboard FCAL: Enabled
Onboard Net1: Enabled
Onboard Net0: Enabled
Onboard IDE: Enabled
PCI Slots: Enabled

ok .env (will still not display the status for CPU1 & CPU3)

After power-cycle using the front power button both CPU's will be back on-line.

3.To disable and then enable the entire CPU module in Slot B (both CPU1 & CPU3) the following commands can be used as well:

To bring back the cpu's in slot B use the command:

After a reset-all and power-cycle using the front power button the system the cpu's in slot B (cpu1 and cpu3) will be back online.


Documentations about ASR:
V480 Documentation    -    V490 Documentation
V480 Server Administration Guide /Chapter 10
V490 Server Administration Guide /Chapter 4

V880 Documentation    -     V890 Documentation
V880 Sun Fire 880 Server Owner's Guide /Chapter 6
V890 Sun Fire V890 Server Owner's Guide/ Chapter 6

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