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Unix Version 7 - man page for update (v7 section 8)

UPDATE(8)				       System Manager's Manual					    UPDATE(8)

NAME
update - periodically update the super block
SYNOPSIS
/etc/update
DESCRIPTION
Update is a program that executes the sync(2) 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, but should be executed out of the initialization shell command file.
SEE ALSO
sync(2), sync(1), init(8)
BUGS
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 DEC hardware that writes zeros when NPR requests fail. A fix would be to have sync(1) tempo- rarily 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. UPDATE(8)


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