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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 with the psradm(1M) command or the p_online(2) system call.
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 LWPs can be taken offline. Some hardware platforms can require some processors to be online at all times. A processor can be taken offline with the psradm(1M) command or the p_online(2) system call. Once a processor has been taken offline, it remains in that state until it is brought back online using the psradm(1M) command or the p_online(2) system call.