A predetermined reaction of a metric surpassing a threshold value by one of the variables from its internal state.
A data element containing all facts (names, IDs, parameters, numbers, and so on) related to one occurrence of an operation inside the DIVArchive system. For example, Tape Read Complete, or Tape Eject Complete.
A self-maintained, automated, and configurable storage for Events.
A reading of specific information from an Event or a Resource. For example, the duration of a disk write operation, or the occurrence of a read error on a tape drive.
An instance of one Metric Definition for a specific Resource. Each metric is associated with a specific resource and can receive a flow of measurements from that attached resource.
A metric has an internal state that consists of several numeric values that it updates on its own when given new measurements. It provides read access to this logically consistent state. Each metric can be used as a measurement value for the state of another metric. You can reset the internal state at any time. You can also enable or disable metrics.
Defines how a Metric is calculated by specifying which Events are examined, which Measurements are extracted, how they are aggregated (Collection Type), and which Resource the aggregation is based on. See Appendix B for predefined metrics in the system.
The metric types are as follows:
Hourly metric types are calculated every hour for the associated resource.
Daily metric types are calculated every day for the associated resource.
Monthly metric types are calculated every month for the associated resource.
Yearly metric types are calculated every year for the associated resource.
Lifetime metric types are calculated throughout the lifetime of the associated resource.