To Heap Dump threshold at 90% total heap memory usage, follow these steps:

1. Switch to root on terminal or admin on cmd.
2. Change path to the DSM installation directory.
3. Run the following commands:

   dsm_c -action changesetting -name settings.configuration.memoryManagerThresholdAutoHeapDump -value true
   dsm_c -action changesetting -name settings.configuration.memoryManagerThreshold -value 0.9

The first command above will enable Java Heap Dump. The second command sets the threshold, 90% as shown in the example above. When the DSM process reaches 90% memory usage, it will generate Java Heap Dump.

To enable Heap Dump generation when manager is getting out of memory error, follow these steps:

1. SSH to the target DSM Linux server and switch to root.
2. Edit or create the dsm_s.vmoptions file.

   # vi /opt/dsm/dsm_s.vmoptions

3. Add a new line and enter this configuration.

   -XX:+HeapDumpOnOutOfMemoryError

4. Below is an example what the content of the file looks like:

   [root@ip-x.x.x.x /]# cat /opt/dsm/dsm_s.vmoptions
   -Xmx6g
   -XX:+HeapDumpOnOutOfMemoryError