SGE_SHADOWD

Section: Sun Grid Engine Administrative Commands (8) Updated: $Date$ Local index Up

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, and to start-up a new 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 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.

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This document was created by man2html, using the manual pages.
Time: 22:02:21 GMT, April 16, 2011