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       sge_shadowd - Sun Grid Engine shadow master daemon




       sge_shadowd  is  a "light weight" process which can be run on so-called
       shadow master hosts in a Sun Grid Engine cluster to detect  failure  of
       the  current  Sun  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 daemons are active in a cluster, they run a
       protocol which ensures that only one of them will start-up a new master

       The   hosts  suitable  for  being used as shadow master hosts must have
       shared     root     read/write     access     to     the      directory
       $SGE_ROOT/$SGE_CELL/common  as  well  as  to  the  master  daemon spool
       directory (by default $SGE_ROOT/$SGE_CELL/spool/qmaster).  The names of
       the   shadow   master   hosts   need   to  be  contained  in  the  file


       sge_shadowd may only be started by root.


       SGE_ROOT       Specifies the location of the Sun Grid  Engine  standard
                      configuration files.

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

                             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.

                      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.

                      If set, specifies the tcp port on  which  sge_qmaster(8)
                      is  expected to listen for communication requests.  Most
                      installations will use a  services  map  entry  for  the
                      service "sge_qmaster" instead to define that port.

       SGE_DELAY_TIME This variable controls the interval in which sge_shadowd
                      pauses if a takeover bid fails. This value is used  only
                      when  there  are multiple sge_shadowd instances and they
                      are contending to be the master.   The  default  is  600

                      This   variable  controls  the  interval  in  which  the
                      sge_shadowd checks the heartbeat  file  (60  seconds  by

                      This  variable  controls the interval when a sge_shadowd
                      instance tries to take over when the heartbeat file  has
                      not changed.


                       Default configuration directory
                       Shadow master hostname file.
                       Default master daemon spool directory
                       The heartbeat file.


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


       See sge_intro(1) for a full statement of rights and permissions.