H3C Technologies H3C Intelligent Management Center - Manual (Page 136)

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10 Terminology
• Basic index: NQA operation type, such as ICMP echo, DHCP, FTP, HTTP, UDP jitter, TCP
connection, UDP echo, voice, and DLSw.
• Compound KQI: Includes multiple KQIs. Place multiple KQIs into a compound KQI for service
evaluation when they all affect the same service. A higher-level compound KQI can have multiple
lower-level compound KQIs.
• KPI: Key Performance Index provides basic parameters for KQIs. KPI data comes from the NQA
instance module, Performance Management, and NTA.
• KQI: Key Quality Index includes one or multiple KPIs, KQI formula, and KQI evaluation method.
KQIs provide statistics for SLAs.
• MTBF: Mean Time Between Failures. The bigger the value, the better the service quality.
• MTTR: Mean Time To Repair, or the average time for recovering failures. The smaller the value, the
better the service quality.
• NQA group: Includes one or multiple NQA instances.
• NQA instance: Task of testing a link or network service. An NQA instance runs after it is deployed.
SHM gets the NQA instance result for analysis.
• NQA level: Provides threshold information for NQA instances.
• NQA type: Includes one or multiple basic indexes.
• NQA: Network Quality Analyzer measures the quality of links and network services through
performance parameters, such as delay, jitter, time for establishing a TCP or FTP connection, and
FTP file transmission rate.
• NTA: Network Traffic Analyzer is an IMC component that monitors network traffic of an interface,
host, or application in real time. It also provides network traffic statistics and analysis.
• SLA: Service Level Agreement provides a health monitoring solution for IT-orientated services. It
gets KPIs from the NQA instance module and IMC components, and evaluates the service health
level based on the evaluation policy.