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MOUNT_LFS(8)		  BSD System Manager's Manual		  MOUNT_LFS(8)

NAME
     mount_lfs — mount a log-structured file system

SYNOPSIS
     mount_lfs [-bdins] [-N nsegs] [-o options] special node

DESCRIPTION
     The mount_lfs command attaches a log-structured file system special
     device on to the file system tree at the point node.  Both special and
     node are converted to absolute paths before use.  In addition, the
     lfs_cleanerd(8) utility is invoked to clean the file system periodically.

     This command is normally executed by mount(8) at boot time.

     The options are as follows:

     -b	     Instruct the cleaner to count bytes written, rather than segments
	     read, to determine how many segments to clean at once.

     -d	     Run lfs_cleanerd(8) in debug mode.

     -i	     Instruct the cleaner to use filesystem idle time as the criterion
	     for aggressive cleaning, instead of system load.

     -o	     Options are specified with a -o flag followed by a comma sepa‐
	     rated string of options.  See the mount(8) man page for possible
	     options and their meanings.

     -N nsegs
	     Clean nsegs segments (or bytes' worth of segments if -b is also
	     specified) at a time.

     -n	     Don't start lfs_cleanerd(8) on the file system.

     -s	     Cause lfs_cleanerd(8) to read data in small chunks when cleaning
	     the file system.

SEE ALSO
     mount(2), unmount(2), fstab(5), dump_lfs(8), lfs_cleanerd(8), mount(8),
     newfs_lfs(8)

     Ousterhout and Douglis, "Beating the I/O Bottleneck: A Case for Log-
     structured File Systems", Operating Systems Review, No. 1, Vol. 23, pp.
     11-27, 1989, also available as Technical Report UCB/CSD 88/467.

     Rosenblum and Ousterhout, "The Design and Implementation of a Log-
     Structured File System", ACM SIGOPS Operating Systems Review, No. 5, Vol.
     25, 1991.

     Seltzer, "File System Performance and Transaction Support", PhD Thesis,
     University of California, Berkeley, 1992, also available as Technical
     Report UCB/ERL M92.

     Seltzer, Bostic, McKusick and Staelin, "An Implementation of a Log-
     Structured File System for UNIX", Proc. of the Winter 1993 USENIX Conf.,
     pp. 315-331, 1993.

HISTORY
     The mount_lfs function first appeared in 4.4BSD.

BSD				March 31, 2005				   BSD

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