NAME

       sge_shadowd - Sun Grid Engine shadow master daemon

SYNOPSIS

       sge_shadowd

DESCRIPTION

       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 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/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 $SGE_ROOT/$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 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.

       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.

       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 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 seconds.

       SGE_CHECK_INTERVAL
                      This  variable  controls  the  interval in which the sge_shadowd checks the
                      heartbeat file (60 seconds by default).

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

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
       <sge_root>/<cell>/spool/qmaster/heartbeat
                       The heartbeat file.

SEE ALSO

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

COPYRIGHT

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