Accessing AliveServerCount for cluster, independent of Managed Servers

Question

Hi,
I'm looking at a script to check the AliveServerCount value for a given cluster, but am only aware of this value existing within the scope of each ServerRuntime underneath the domainRuntime mode on the admin server. Is there not an authoritative place for this value? We monitor it via a BMC plugin, and it reports this value as a direct aatribute of the cluster, without referring to any servers specifically.
Any clues if I can get this value more easily? No sign of a getAliveServerCount()...
Additionally, if a Managed server is down, what would happen if I query it's ServerRuntime data via the domainRuntime from the admin server? An exception would be thrown? Mostly here i'm looking at JMSRuntime data, queue sizes etc, but also general data like Hogging Threads
Thanks
Chris

Answer 1

Hi Chris,
1).
If you want to get the AliveServerCount of your Cluster ...then you need to invoke getAliveServerCount() method on "*weblogic.management.runtime.ClusterRuntimeMBean*"
In the Following Link...there is a Program mentioned which displays the State of All the Servers Available in a Cluster:
http://jaysensharma.wordpress.com/2009/12/05/cluster-details-jmx/
The Program mentioned in the Above link has one line where it gets the ClusterRuntimeMBean object:
for(ObjectName cl:cluster_list)
System.out.println(“######### \n Cluster Name: ” + (String) connection.getAttribute(cl,”Name”));
ObjectName[] servers = (ObjectName[])connection.getAttribute(cl,”Servers”);
at this portion of the Code you can invoke the "AliveServerCount"
<font color=green>
*2). Mostly here i'm looking at JMSRuntime data, queue sizes etc, but also general data like Hogging Threads.* </font>
In the Following Link you will find the JMX code for JMS, JVM and ThreadPool Monitoring Script in a Single Code.
http://jaysensharma.wordpress.com/2009/12/06/jdbc_jms_threadpool_jvm-monitoring/
Thanks
Jay SenSharma