Manual Reference Pages - SYNCER (4)
- file system synchronizer kernel process
kernel process helps protect the integrity of disk volumes
by flushing volatile cached file system data to disk.
The kernel places all
vnode 9 s
in a number of queues.
process works through the queues
in a round-robin fashion,
usually processing one queue per second.
on that queue,
process forces a write out to disk of its dirty buffers.
The usual delay between the time buffers are dirtied
and the time they are synced
is controlled by the following
| Variable Default Description
kern.filedelay 30 time to delay syncing files
kern.dirdelay 29 time to delay syncing directories
kern.metadelay 28 time to delay syncing metadata
process is a descendant of the
command, which appeared in
AT&T v6 ,
and was usually started by
when the system went multi-user.
A kernel initiated
process first appeared in
.Fx 2.0 .
It is possible on some systems that a
occurring simultaneously with a crash may cause
file system damage.
Visit the GSP FreeBSD Man Page Interface.
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