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.





























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