It's a powerful part of an HP 3000 that runs whenever the server is plugged in. The Guardian Service Processor (GSP) is the maintenance control console commanding the ultimate class of the server to reboot, do memory dumps and even fully power down the 3000. Consultant Craig Lalley of EchoTech has noted the GSP has one fewer feature than its Unix counterpart, though.
"On HP-UX it is possible to reset the GSP from the host OS," he said. "I have not found a way from MPE."
From time to time a reset may be required for diagnostics services on A-Class and N-Class servers. If your 3000 gets loving care from a consultant or service provider outside your computer room, you may need a paper clip to keep up service levels.
The GSP can also reveal the 3000's speedometer, as profiled near the bottom of a webpage from Allegro Consultants.
The gap between 3000 and HP's HP-UX Integrity GSPs is a common shortfall of HP designs. Even though the 3000's MPE/iX includes a Posix interface, HP didn't engineer enough Unix into the 3000 to enable some administration that HP-UX users enjoy. (That lack of Unix can sometimes be a good thing when a security breach opens up in the Unix world.)
But when a 3000 needs a GSP reset, pressing a recessed button on the 3000's back will do the trick if a telnet command doesn't work. You can telnet to the IP address of the GSP, log in and do the reset. But you can also get someone to press the physical reset button at the back of the machine. It's recessed into the cabinet so you may need a magic paper clip bent just so.
Lalley calls the GSP, which HP introduced with its final generation of 3000s, one of the most useful things in the A-Class and N-Class boxes.
The GSP is a small computer that is always powered on when the plug has power. With it, it is possible to telnet to and BE the console. While multiple admins can telnet in and watch, only one has the keyboard.
It is possible to reboot, memory dumps and even fully power down the HP 3000 from the GSP. Use the command PC OFF.
It is probably the best feature of the N-Class and A-class boxes. The problem is sometimes it needs to be reset, usually with a paper clip. Since the GSP is a different CPU, this reset can be done during business hours.