Performance Tuning of the eG SCOM Connector

To minimize the load on the SCOM connector and to ensure its peak performance at all times, eG Enterprise sends the measures of only the ‘abnormal’ descriptors to the SCOM connector by default. This default setting is governed by the DisplayDescriptors parameter and the DescriptorsToTransmit parameter in the eg_scom.ini file (in the <EG_INSTALL_DIR>\manager\config directory). By default, the DisplayDescriptors flag, which is in the [misc_args] section of the file, is set to concise. This indicates that measures reported by a concise set of descriptors alone will be communicated to the SCOM connector. To know which are these descriptors, take a look at the default setting of the DescriptorsToTransmit parameter in the [concise_settings] section of the file. This parameter is set to bad by default. This indicates that measures of ‘abnormal’ descriptors will only be transmitted to the SCOM connector at all times. For instance, take the case of the Disk Space test, which reports metrics for descriptor C and D. Say that the descriptor C is in an abnormal state and D is in a normal state. In this case, the default setting of the DescriptorsToTransmit parameter will ensure that only the descriptor C and its measures are sent to the connector, and not descriptor D.

If you want the measures of all descriptors of all tests to be transmitted to the SCOM connector, regardless of their state, then set the DisplayDescriptors parameter to All. Once this is done, then the [concise_settings] section and the parameters within will no longer apply.

On the other hand, if you want the measures of all descriptors (i.e., both normal and abnormal descriptors) of ‘abnormal’ tests alone to be transmitted to the SCOM connector, then, do the following:

1. Set the DisplayDescriptors parameter in the [misc_args] section to concise.
2. Set the DescriptorsToTransmit parameter in the [concise_settings] section to all.

In this case however, normal tests and their descriptors will be disregarded. For instance, if the descriptor C of Disk Space test is in an abnormal state and descriptor D is in a normal state, then the measures of both descriptor C and D will be sent to the SCOM connector. However, if a Disk Activity test exists, with all descriptors in a normal state, then this test and all its descriptors will be ignored.   

Since the all setting of the DescriptorsToTransmit parameter ensures that even normal descriptors (of abnormal tests) are considered, the connector may sometimes experience a descriptor overload – this is commonplace where tests report metrics for hundreds of descriptors. To minimize load on the connector under such circumstances, a DescriptorMaxLimit parameter is available in the [concise_settings] section. This parameter applies only if the DisplayDescriptors flag is set to concise and the DescriptorsToTransmit parameter is set to all. By default, the DescriptorsMaxLimit parameter is set to 10. This means that for each ‘abnormal test’ (that supports descriptors), eG Enterprise will send the measures of a maximum of 10 descriptors alone to the SCOM connector. These 10 descriptors will include both normal and abnormal descriptors. If the ‘abnormal’ test supports more than 10 descriptors, then eG Enterprise will automatically send the measures of the ‘abnormal’ descriptors alone to the SCOM connector.