HP NonStop G-Series - Manual (Page 9)

Performance Monitor and Alert GUI can be invoked as a web-tool from HP SIM tools menu.
The Performance Monitor component queries the performance database for the latest
snapshot data for the selected target systems or cluster. All the received data are then
categorized and presented in a separate window. This component is responsible for data
representation only. Alert Settings in this interface can be used to construct new alerts.
Each alert has a unique ID associated with it. For a new alert, the user may select a server,
select an entity/counter, and input a threshold value and the operator. It is also possible to
select a notification policy (console, email and/or SMS). The notification policy is bound to
the alert ID.
The task which updates the status column is an automated task handled by HP SIM. The
task scheduler of HP SIM invokes this task periodically. Upon each invocation, it determines
the list of target servers from the list of clusters and sends the list to the Notification
Manager. Notification Manager returns the status of each target server. It then updates the
performance status column for each target server as well as the performance status of the
NonStop clusters. Notification Manager also determines if there is any event that satisfies
any alert defined so far. If any such event occurs, it retrieves the notification policy from the
database and invokes that policy.
An agent is comprised of three subcomponents: collector, collator and worker.
Collector: A collector is a program running independently in a NonStop or Linux server. It
communicates with the Collator. There can be multiple collectors running in a server, each
gathering some performance metrics. Collector is primarily responsible for gathering
performance data. Performance metrics are organized as groups called entities or categories.
Each group may have one or more metrics to be monitored. For example, a CPU
entity/category may include CPU Busy and Memory Usage metrics. A collector may collect
data for multiple entities or only certain parameters of an entity. The collector collects the
data periodically and reports the instantaneous data to the collator.
Collator: Collator is the information center for a managed node. There is only one collator
in a server. Once started, it listens for requests from the worker as well as data sent by
collectors. On the Linux node, the communication takes place via TCP. The TCP port number
is published in a configuration file in the Performance Essentials installation folder/sub-
Performance Essentials HP SIM Client and NonStop & Linux Host User Guide – 544813 – 004
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