The Performance Management Tools (PMT) use terms
you might be unfamiliar with or have different
meanings for. This glossary provides the PMT definitions
for you.
| archive
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| |
A file containing data gathered
by PMT. Instead of watching data displayed
in real time, you can capture data in an archive
and graph the data later. |
cron |
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A UNIX daemon that executes
commands at a specified time. The daemon reads
these commands from the crontab file. |
cluster |
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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.
|
group |
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A collection of nodes and/or
clusters that are frequently managed together.
|
managed node |
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Managed nodes are those that
run one or more metrics servers recognized
by PMT. |
management station |
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Management stations are the
operating centers for managing and monitoring
the nodes in the system. |
metric |
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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.
|
metrics server |
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|
A UNIX daemon process that
services requests for system information.
PMT includes support for several metrics servers.
|
MIB |
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Management information base
|
node |
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A computer system that is
uniquely addressable on a network. A node
can have more than one CPU. |
threshold |
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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. |
