SYNOPSIS
       sge_shadowd

DESCRIPTION
       sge_shadowd  is  a "light weight" process which can be run on so-called
       shadow master hosts in a Univa Grid Engine cluster to detect failure of
       the  current  Univa  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
       daemon.

       The   hosts  suitable  for  being used as shadow master hosts must have
       shared root read/write access to the directory $SGE_ROOT/$SGE_CELL/com-
       mon  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
       $SGE_ROOT/$xQS_NAME_Sxx_CELL/common/shadow_masters.

RESTRICTIONS
       sge_shadowd may only be started by root.

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

       SGE_CELL       If set, specifies the default Univa Grid Engine cell. To
                      address a Univa 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.


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

       SGE_QMASTER_PORT
                      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 ser-
                      vice "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
                      seconds.

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

SEE ALSO
       sge_intro(1),  sge_conf(5), sge_qmaster(8), Univa Grid Engine Installa-
       tion and Administration Guide.

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



UGE 8.0.0                $Date: 2007/11/08 23:04:23 $           SGE_SHADOWD(8)