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 separated 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.