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by jmj42 4475 days ago
This is likely a sun thing. Halt on (SPARC) Solaris does not shutdown the OS. It issues a reset command to the firmware. The halt command on Solaris is roughly equivalent to pressing the reset button on a PC.

When your Sun is particularly hosed we used sync;sync;sync; halt to reset and (hopefully) not lose any data (sync forces OS write buffers to purge)