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Performance Monitors that Get Results



Monitor Checklist

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Calling All Collections

Performance-management products collect data passively, actively or in some combination of both. Each approach yields different results.

Passive data collection relies on actual traffic and derives performance statistics from real users and network and system conditions. An agent on an end user's PC, for instance, watches the network stack and reports throughput back to a central server. Lucent Technologies' Vital Suite uses passive agents. Passive probes monitor a data stream through a span port on a switch or a tap on a network segment. Probes from Compuware and WildPackets promiscuously decode the traffic to count on anything from packets to transactions.

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