Disable a CPU in Solaris Using psradm
Contributed by Dave 
Tagged: Solaris system administration On supported Enterprise systems such as the E4500, individual CPUs and memory boards can be disabled at will. If, for instance, /var/adm/messages is filled with errors regarding CPU1, then it can be taken offline until a replacement CPU arrives.
The following uses CPU1 as an example:
1. View /var/adm/messages to figure out which CPU is having problems.
2. Use psrinfo to view your CPU configuration.
3. As root, take the CPU offline using the command ‘psradm -f 1′
3a. The syntax is ‘psradm
4. Verify the CPU is offline with ‘psrinfo’
5. To bring an offline CPU back online, use ‘psradm -n 1′
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