Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Informacje Techniczne Pobierz pdf (Strona 171)

Chapter 8. Capacity Manager 161

Figure 152. Forecast graph

To see the forecast for your selected systems, click the Forecast icon in the

lower-right corner of the window. A graph similar to Figure 152 appears. The

forecast is for whatever monitor you currently have selected. To see a forecast for

another monitor, click its name in the monitor box.

Note: You cannot use both zoom and forecast at the same time; they are mutually

exclusive such that one is turned off when the other is turned on.

The forecast line is a dashed line with an arrow at the end. The forecast interval is

a multiple of your data collection period. The default prediction period is set to the

same length as the data collection period. For example, if you have a month of

collected data, the forecast will be for a month into the future.

The confidence interval is represented by the dotted lines above and below the

forecast line. The vertical bar at the beginning of the forecast data depicts the

range. The gap between the actual collected data and the beginning of the

predicted data serves as a separator between these two data sets.

Capacity Manager will display one of two warnings if your forecast is not valid.

Invalid forecasts should not be used to make decisions about your systems.

•“Data collection period too short for a valid forecast.” To generate a valid forecast,

you need at least 21 days of data.

•“System 'X' does not have enough data for forecasting”,or“Multiple systems do

not have enough data for forecasting.” One of these two messages will appear

when you have a sufficiently long period for data collection, but one or more

monitors were not on for at least 50% of the time during the data collection period.

Note: The forecast is more meaningful for individually graphed systems than for

those shown in a trend graph. To change your graph from a trend graph to a

graph of individual systems, either set your trend graph threshold to a higher

number or select fewer systems to graph at one time.

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Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Informacje Techniczne Strona 171