====== HACMP resources denpendency ======

On an HACMP cluster with 2 resources, if you want to use dependencies to start one resource before the other, you have to use an "Application Monitor". 

==== First select the relation parent/child between the resources: ====
<code>
# smitty hacmp
--> Extended Configuration
--> Extended Resource Configuration
--> Configure Resource Group Run-Time Policies
--> Configure Dependencies between Resource Groups
--> Configure Parent/Child Dependency
--> Add Parent/Child Dependency between Resource Groups
</code>
<code>
                     Select the Parent Resource Group
                       
                              oradbdbrg
                              oradbrtrg
</code>
<code>
                   Select the Child Resource Group                     

                              oradbrtrg                      
</code>
<code>
                 Add Parent/Child Dependency between Resource Groups

* Parent Resource Group       [oradbdbrg]                           +
* Child Resource Group        [oradbrtrg]                           +
</code>


==== Second, create a custom script to monitor the startup of the parent resource (this is just a sample to test): ====
<cli prompt='#'>
[root@oraclu1]/home/scripts# cat monitordb.sh
#!/usr/bin/ksh
logpath=`dirname $0`
sn=`basename $0 | cut -d. -f1`
logname=$logpath/$sn.log


NUM=`date "+%d-%m-%Y %H:%M:%S"`
process="/usr/sbin/writesrv"

ps -ef | grep "$process" | grep -v grep > /dev/null 2>&1
if [ $? -eq 0 ]
then
  echo "OK:  $NUM    process $process found" >> $logname
  exit 0
else
  echo "NOK: $NUM    process $process not found" >> $logname
  exit 1
fi
</cli>

==== Third, configure the monitoring of the parent resource in HACMP: ====
<code>
# smitty hacmp
--> Extended Configuration
--> Extended Resource Configuration
--> HACMP Extended Resources Configuration
--> Configure HACMP Applications Servers
--> Configure HACMP Application Monitoring 
--> Configure Custom Application Monitors
--> Add a Custom Application Monitor
</code>
<code>
                     Add Custom Application Monitor

* Monitor Name                                        oradbdbmon
  Application Server(s) to Monitor                    oradbdbapp                                               +
* Monitor Mode                                       [Startup Monitoring]                                      +
* Monitor Method                                     [/home/scripts/monitordb.sh]
  Monitor Interval                                   [60]                                                      #
  Hung Monitor Signal                                [9]                                                       #
* Stabilization Interval                             [300]                                                     #
  Restart Count                                      [0]                                                       #
  Restart Interval                                   [0]                                                       #
* Action on Application Failure                      [notify]                                                  +
  Notify Method                                      []
  Cleanup Method                                     []
  Restart Method                                     []
</code>

==== Now you can synchronize HACMP and test. ====