Интерактивная система просмотра системных руководств (man-ов)
>> syncer (4) ( FreeBSD man: Специальные файлы /dev/* )
- 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
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 Ta Default Ta Description
kern.filedelay Ta 30 Ta time to delay syncing files
kern.dirdelay Ta 29 Ta time to delay syncing directories
kern.metadelay Ta 28 Ta time to delay syncing metadata
process is a descendant of the
command, which appeared in
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.