Disable a CPU in Solaris using psradm

Contributed by Dave October 12, 2003  
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.

Using 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′