NAME

update − periodically update the super block

SYNTAX

/etc/update

DESCRIPTION

The update program executes the sync() primitive every 30 seconds. This insures that the file system is fairly up to date in case of a crash. This command should not be executed directly. Rather, it should be executed out of the initialization shell command file.

RESTRICTIONS

With update running, if the CPU is halted just as the sync is executed, a file system can be damaged. This is partially due to DIGITAL hardware that writes zeros when NPR requests fail. A fix would be to have sync() temporarily increment the system time by at least 30 seconds to trigger the execution of update. This would give 30 seconds grace to halt the CPU.

SEE ALSO

sync(1), sync(2), init(8), rc(8),

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