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When a processor is online, it can dispatch processes and perform normal operating system functions. You can bring a processor online using the Processor Manager or the psradm(1M) command.
Taking a processor offline removes the processor from operational status. The processor retains its place in the system but does not perform any useful operations while it is idle. Only processors with no bound processes or light-weight processes (LWPs) can be taken offline. Some hardware platforms may require certain processors to be online at all times. A processor can be taken offline using the Processor Manager or the psradm(1M) command. Once a processor has been taken offline, it remains in that state until it is brought back online.