xlv_labd(7M)

NAME
     xlv_labd, xlv_plexd, xlvd - logical volume daemons

SYNOPSIS
     xlv_labd
     xlv_plexd [ -m #_subprocs ] [ -b blocksize ] [ -w sleep-interval ]
          [ -v verbosity ] [ -h ]

DESCRIPTION
     xlv_labd, xlv_plexd, and xlvd are logical volume daemons.  xlv_labd and
     xlv_plexd reside in user process space and xlvd resides in kernel process
     space.

     The XLV label daemon, xlv_labd, is a user process that writes logical
     volume disk labels.  It is normally started during system restart.  Upon
     startup, xlv_labd immediately calls into the kernel to wait for an action
     request from the kernel daemon, xlvd.  When an action request comes,
     xlv_labd processes it and updates the appropriate volume disk labels.
     After completing the update, xlv_labd calls back into the kernel to wait
     for another request.

     The XLV plex copy daemon, xlv_plexd, is a user process responsible for
     making all plexes within a subvolume consistent.  The master xlv_plexd
     process is started at system startup time with the -m option and
     subsequently used when new plexes are added.  It receives requests to
     revive plexes via the named pipe /etc/.xlv_plexd_request_fifo and starts
     child processes to perform the actual plex copy.

     -m #_subprocs       #_subprocs is the maximum number of subprocesses the
                         master xlv_plexd process forks off at any given time.

     -b blocksize        blocksize is the granularity of a single plex copy
                         operation in blocks.  The default is 128 blocks,
                         which means XLV initiates a plex copy of 128 blocks,
                         sleeps as indicated by the -w option (see below),
                         then moves on to the next set of 128 blocks.

     -w sleep-interval   sleep-interval is an arbitrary delay enforced at
                         regular intervals while performing a plex copy in
                         order to share available disk bandwidth.  The default
                         delay is 0.

     -v verbosity        verbosity is the level of verbosity.  The minimum is
                         0 and the maximum is 3.  xlv_plexd writes its
                         messages to syslog.  The default verbosity is 2.

     -h                  Print the help message.

     The XLV daemon, xlvd, is a kernel process that handles I/O to plexes and
     performs plex error recovery.  When disk labels require updating, xlvd
     initiates an action request to xlv_labd to perform the disk label update.
     If there aren't multiple plexes, xlvd does not do anything.
NOTE
     All three daemons are automatically started and do not need to be
     explicitly invoked.

FILES
     /etc/.xlv_plexd_request_fifo

SEE ALSO
     xlv(7M).