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changing xmx values in nms-cluster.properties

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Hello,

Is there any concern to raising the xmx value in nms-cluster.properties.

 

Thanx.

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Hello Abdullah

 

You should install Patch #3 for NNMi 9.2x, this patch contains a fix for a memory leak in jgroups/nnmcluster.

 

Additionally, please open a case with HP support to get the Postgres hotfix "HF-NNMI-9.2X-LIN-POSTGRESQL-20130530"  to upgrade the Postgres DB to a newer version to prevent a possible problem with the Postgres DB backup in Application Failover. Of course, this hotfix is not needed if you have Oracle installed.

 

Kind regards,

Dieter

HP Support
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Hi AbdullahKamal

 

The Xmx/Xms values in the nms-cluster.properties file are for the nnncluster binary and don't need to be tuned under normal circumstances. A stack size of 256MB is sufficient to have the nnmcluster processes run all their tasks. If you increase Xmx then the java virtual machine started by the nnmcluster processes may allocate more memory, but that doesn't change the nnmcluster performance.

 

Kind regards

Dieter

HP Support
If you find that this or any post resolves your issue, please be sure to mark it as an accepted solution.
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Thanx Dieter,
I've an issue with NNMi failover where the JGroup log mentions an issue with java heap.

The actual issue is that about a every month, the cluster stops seeing the standby server where we would need to restart both servers. Stopping the deamon does not work. It only works after restarting the servers.

I'm assuming that cluster deamon is requiring more memory over time???

I found the Xmx/Xms values are commented, so what is the size of the memory allocated to the deamon.

We're running NNMi 9.22 on Linux.
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Absent Member.
Absent Member.

Hello Abdullah

 

You should install Patch #3 for NNMi 9.2x, this patch contains a fix for a memory leak in jgroups/nnmcluster.

 

Additionally, please open a case with HP support to get the Postgres hotfix "HF-NNMI-9.2X-LIN-POSTGRESQL-20130530"  to upgrade the Postgres DB to a newer version to prevent a possible problem with the Postgres DB backup in Application Failover. Of course, this hotfix is not needed if you have Oracle installed.

 

Kind regards,

Dieter

HP Support
If you find that this or any post resolves your issue, please be sure to mark it as an accepted solution.

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Thanx dieter,
We applied patch 3 as recommended and it seems all is well. We'll see in about a month.

Can you tell me what is the size of the memory allocated to the deamon by default?
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Hello

 

The amount of memory nnmcluster allocates will depend on several factors, there is no 'ideal' size to speak so. However, the overall size should be stable over time.

 

A memory leak manifests itself by seeing a steady incease of memory allocated over a period of time.

 

Hope this helps

Dieter

HP Support
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Good day Dieter,

Is there any command that I would know the current utlization of the nnmcluster jave memeory heap.

thank you
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Absent Member.

Hello

 

To get java heap, stack, garbage collection and other measures you would need to install a JVM profiling tool. For the purpose of checking the size of nnmcluster, it normally is sufficient to use top or sar and check the memory size allocated. Tools such as HP Glance may provide further details on the process, but not the JVM details.

 

BR

Dieter

 

 

HP Support
If you find that this or any post resolves your issue, please be sure to mark it as an accepted solution.
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