How to determine whether a resource is online in a cluster from a script

Question

Hello All,
Environment:
Solaris 9
SC3.1/U4 and SC3.2
RG name:
dw-rg
Resources:
dw-vip - Logical hostname RS
dw-stor - HA storage RS
dw-ora - HA Oracle RS
dw-lis - HA Oracle listiner RS
Hostnames:
dwn1
dwn2
We have a situation where we are trying to backup an oracle DB's on our clusters. We are performing both hot and cold backups. During a cold backup, we take the database completely down and the other where we put the DB into hot backup mode.
In the coldbackup case, we simply take the oracle RS offline and in the hotbackup case, the oracle RS in still online. The scripts are ran from cron on each cluster node.
In the coldbackup case, As a consistency/error check I would like to first check the status of the oracle rs and see if it is online somewhere in the cluster.
in the hot backup case, I need to run the script from the cluster node that RG/RS is running on.
Since I am checking status and return codes, I don't want to use scstat and grep to get this information if I can avoid it, but, I would either write a C program or script to do this.
Any ideas or sugguestions would be greatly appreciated
Thanks in advance
George

Answer 1

You can use the Sun Cluster library functions, have a look at the manpage for scha_calls(3ha).
In your specific case you could have a cronjob running on each node. The first thing it would do is to check if the resource you are interested is online on the node, like
RS_STATUS=`/usr/cluster/bin/scha_resource_get -G dw-rg -R dw-ora -O RESOURCE_STATE`
if [ "$RS_STATUS" != ONLINE ] ; then
        exit 0
else
        <do what you need to do>
fiGreets
Thorsten