sync(1M)sync(1M)NAME
sync - synchronize file systems
SYNOPSIS DESCRIPTION
executes the system call (see sync(2)). If the system is to be stopped, the command must be called to ensure file system integrity.
flushes all previously unwritten system buffers including modified super blocks, modified inodes, and delayed block I/O out to disk. This
ensures that all file modifications are properly saved before performing a critical operation such as a system shutdown. For additional
protection from power failures or possible system crashes, use to execute automatically at periodic intervals (see syncer(1M)).
AUTHOR
was developed by AT&T and HP.
SEE ALSO syncer(1M), sync(2).
STANDARDS CONFORMANCE sync(1M)
Check Out this Related Man Page
SYNCER(4) BSD Kernel Interfaces Manual SYNCER(4)NAME
syncer -- file system synchronizer kernel process
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 pro-
cessing 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
The syncer process is a descendant of the 'update' command, which 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.
BUGS
It is possible on some systems that a sync(2) occurring simultaneously with a crash may cause file system damage. See fsck(8).
BSD July 14, 2000 BSD
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