UPDATE
Section: Maintenance Commands (8)
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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)
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.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- SEE ALSO
-
- BUGS
-
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Time: 10:17:44 GMT, December 28, 2024