    NAME
         sge_shadowd - Grid Engine shadow master daemon

    SYNOPSIS
         sge_shadowd

    DESCRIPTION
         sge_shadowd is a "light weight" process which can be run  on
         the  so  called shadow master hosts in a Grid Engine cluster
         to detect failure of the current Grid Engine  master  daemon
         sge_qmaster(8)  and  to start-up a new sge_qmaster(8) on the
         host on which the sge_shadowd runs. If multiple shadow  dae-
         mons  are  active  in  a  cluster, they run a protocol which
         ensures that only one of them will  start-up  a  new  master
         daemon.

         The  hosts suitable for being used as  shadow  master  hosts
         must  have  shared  root  read write access to the directory
         <sge_root>/<cell>/common as well as  to  the  master  daemon
         spool  directory  (Default <sge_root>/<cell>/spool/qmaster).
         The shadow master hosts need to be  contained  in  the  file
         <sge_root>/<cell>/common/shadow_masters.

    RESTRICTIONS
         sge_shadowd may only be started from root.

    ENVIRONMENT VARIABLES
         SGE_ROOT       Specifies the location  of  the  Grid  Engine
                        standard configuration files.

         SGE_CELL       If set, specifies  the  default  Grid  Engine
                        cell.   To   address   a   Grid  Engine  cell
                        sge_shadowd  uses  (in  the  order  of   pre-
                        cedence):

                             The name of the cell  specified  in  the
                             environment  variable SGE_CELL, if it is
                             set.

                             The  name  of  the  default  cell,  i.e.
                             default.

         SGE_DEBUG_LEVEL
                        If  set,  specifies  that  debug  information
                        should  be written to stderr. In addition the
                        level of detail in which debug information is
                        generated is defined.

         COMMD_PORT     If set,  specifies  the  tcp  port  on  which
                        sge_commd(8)  is  expected to listen for com-
                        munication requests.  Most installations will
                        use  a  services  map entry instead to define
                        that port.

         COMMD_HOST     If set, specifies the host on which the  par-
                        ticular  sge_commd(8)  to  be  used  for Grid
                        Engine  communication  of   the   sge_shadowd
                        client  resides.   Per default the local host
                        is used.

    FILES
         <sge_root>/<cell>/common
                         Default configuration directory
         <sge_root>/<cell>/common/shadow_masters
                         Shadow master hostname file.
         <sge_root>/<cell>/spool/qmaster
                         Default master daemon spool directory

    SEE ALSO
         sge_intro(1),  sge_conf(5),  sge_commd(8),   sge_qmaster(8),
         Grid Engine Installation and Administration Guide.

    COPYRIGHT
         See sge_intro(1) for a full statement of rights and  permis-
         sions.