A file containing data gathered by Performance Manager. Instead of watching data displayed in real time, you can capture data in an archive and graph the data later.
A UNIX daemon that executes commands at a specified time. The daemon reads these commands from the crontab file.
A collection of nodes that appears to be a single-server system, allowing for greater application availability and scalability than would be possible with a single system.
One member of a TruCluster Production Server cluster is designated as director, and is identified with a director name. PM uses this value to recognize the cluster and populate the GUI with the members.
A collection of nodes and/or clusters that are frequently managed together.
Nodes that are the operating centers for managing and monitoring the nodes in the network.
A particular item of information about a node. For example, the average run queue length over the past 5 seconds, the number of bytes transferred to or from a disk, or the number of characters sent to a terminal. Performance Manager has several hundred metrics, divided among several categories (CPU, Disk, Network, and so on).
A UNIX daemon process that services requests for system information. Performance Manager includes support for several metrics servers.
A computer system that is uniquely addressable on a network. A node can have more than one CPU.
In thresholding, the rearm point occurs when the metric drops a specified amount below the threshold. If the metric recrosses the threshold after rearming, another alert will be sent.
In thresholding, the sampling rate is the interval at which metric samples are taken. The interval is specified in seconds.
A set of choices you make using Performance Manager. A session comprises selected nodes, metrics, display types, intervals, and threshold settings. You can save as many sessions as you want, but you can only run one session at a time.
A tear-off menu has an underscored key letter. If you click that letter, the menu will tear off, or float, in a separate display.
Thrashing is a term for the intensive disk activity that occurs with excessive swapping, usually indicating a memory shortage.
A limit you can set on a metric. If that limit is crossed, an action you previously specified is taken. For example, you could set a threshold of 90% capacity on some or all of your disks, with the action being to run a command that moves some files off that disk.
A tolerance is a specified number of sampling intervals for which a metric must exceed its limit before a threshold is considered crossed.
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