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SYNCER (4) | Special files and drivers | Unix Manual Pages | :man

NAME

syncer - file system synchronizer kernel process

CONTENTS

Synopsis
Description
See Also
History
Bugs

SYNOPSIS

syncer

DESCRIPTION

The syncer 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. The syncer process works through the queues in a round-robin fashion, usually processing one queue per second. For each vnode(9) on that queue, the syncer 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 sysctl(8) tunable variables:

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"

SEE ALSO

sync(2), fsck(8), sync(8), sysctl(8)

HISTORY

BUGS

sync(2) fsck(8).


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