Usually a solaris box has several processors on-board. Here I show you some simple commands like how to enable / disable / spare the processors using  psradm.
When comes to troubleshoot hardware issues it comes handy.

-bash-4.1$ psrinfo
0       on-line   since 02/05/2015 13:36:38
1       on-line   since 02/05/2015 13:36:41
2       on-line   since 02/05/2015 13:36:41
3       on-line   since 02/05/2015 13:36:41
4       on-line   since 02/05/2015 13:36:41
5       on-line   since 02/05/2015 13:36:41
6   ...

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