lfs_cleanerd(8) - NetBSD Manual Pages

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LFS_CLEANERD(8)         NetBSD System Manager's Manual         LFS_CLEANERD(8)


NAME

     lfs_cleanerd - garbage collect a log-structured file system


SYNOPSIS

     lfs_cleanerd [-ds] node


DESCRIPTION

     The lfs_cleanerd command starts a daemon process which garbage-collects
     the log-structured file system residing at the point named by node in the
     global file system namespace.  This command is normally executed by
     mount_lfs(8) when the log-structured file system is mounted.  The daemon
     will exit within a few minutes of when the file system it was cleaning is
     unmounted.

     Garbage collection on a log-structured file system is done by scanning
     the file system's segments for active, i.e. referenced, data and copying
     it to new segments.  When all of the active data in a given segment has
     been copied to a new segment that segment can be marked as empty, thus
     reclaiming the space taken by the inactive data which was in it.

     The following options are available:

     -d      Run in debug mode.  Do not become a daemon process, and print de-
             bugging information.

     -s      When cleaning the file system, read data in small chunks.


SEE ALSO

     mount_lfs(8)


HISTORY

     The lfs_cleanerd utility first appeared in 4.4BSD.

4.4BSD                         December 11, 1993                             1