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UPDATE(4)		 BSD Kernel Interfaces Manual		     UPDATE(4)

NAME
     update -- flush internal filesystem caches	to disk	periodically

SYNOPSIS
     update

DESCRIPTION
     The update	kernel process helps protect the integrity of disk volumes by
     flushing volatile cached filesystem data to disk.	This is	done at	thirty
     second intervals by default.  The time period may be changed by using
     sysctl(8) to modify the kern.update variable.  The	update process does
     the equivalent of the sync(2) function call to do the task.

SEE ALSO
     sync(2), fsck(8), init(8),	rc(8), sync(8),	sysctl(8)

BUGS
     It	is possible on some systems that a sync	occurring simultaneously with
     a crash may cause file system damage.  See	fsck(8).

HISTORY
     An	update command appeared	in Version 6 AT&T UNIX,	and was	usually
     started by	/etc/rc	when the system	went multi-user.  A kernel initiated
     update process first appeared in FreeBSD 2.0.

FreeBSD			       February	11, 1996		       FreeBSD

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | BUGS | HISTORY

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