.\" Copyright (c) 1991 The Regents of the University of California.
.\" %sccs.include.redist.roff%
.\" @(#)update.8 6.6 (Berkeley) %G%
.Nd flush internal filesystem caches to disk frequently
command helps protect the integrity of disk volumes
voliatile cached filesystem data
to disk at thirty second intervals.
function call to do the task.
is commonly invoked at startup time by
when the system goes multi-user.
It is possible on some systems, that a
occuring simultaneously with a crash may cause