How does USM map device inventory and metrics / Performance Data ?

Document ID : KB000045085
Last Modified Date : 12/10/2018
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Introduction:
The article explains inner working how USM maps device and metrics data.
Environment:
UIM any version
Instructions:
Let's walk through a device monitored by net_connect probe.

1. USM uses CM_COMPUTER_SYSTEM.[name] to build device inventory list for display.
CM_COMPUTER_SYSTEM.[cs_id] is checked by [name]

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2. CM_DEVICE.[dev_id] is checked by [cs_id]

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3. CM_CONFIGURATION_ITEM.[ci_id] and NAS_ALARMS (Open Alarms for the device) are checked by [dev_id]

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4. CM_CONFIGURATION_ITEM_METRIC.[ci_metric_id] is checked by [ci_id]

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5. S_QOS_DATA.[table_id], [qos_def_id] are mapped by [ci_metric_id]

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RN_QOS_DATA_XXXX (4 digit format of qos_def_id) stores raw data for the metric.
USM displays that raw data for the last 24 hours.
If no data is found for the last 24 hours, "No data available" is displayed.