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Dell PowerProtect DD Management Center (DDMC) 7.9 Installation and Administration Guide

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Checking projected system capacity

Projection information is available with the capacity information in the Capacity > Systems page and helps to plan future capacity needs.

You can use this information to:

  • Predict when systems run out of storage space or reach a critically low point.
  • Determine future capacity needs by projecting historical and current trends.
  • Determine targets for migration by projecting the systems that are filling up, compare with the same model systems that have space available.
  • Perform CSV export.

Click Calculate Projections for the popout to appear.

  • Select dates in the Date for projection calculation
  • The chart and slider below the chart updates the range of dates visible in the chart
    • Clicking and dragging on the chart selects and "zooms in" to that section of the chart.
    • Then, clicking the - icon in the upper right in this zoomed-in view resizes to display all the available data.
  • Hovering over the chart displays the dates and values on the right side of the chart.
  • Conversely, selecting the date on the right side shows the data (historical, or future projections) for that date.

DDMC classic view Capacity > Projected

Each entry in the table shows the system name and a connection status icon with a dialog box containing a link to the Health > Alerts page. The space usage amounts (size, used, and free) for current and projected months are provided. A storage graphic depicts the system's capacity by percentage that is used, with color coding to show normal, warning, and critical threshold levels. This graphic is a thumbnail version of the default projection chart at the bottom of the page.

The Projected Capacity (By Date) control presents information in three groups of columns. There is also a sparkline chart to present the general shape of the variation.

  • 100% Capacity shows the projection when the system will be 100% full, based on the automatically determined growth rate.
  • Projected Capacity lets you compute the used capacity on a specific date. The system might have free capacity, be full, or be overfull. These columns project how much over capacity the system will be, so you know how much capacity you must free up or buy.
  • Current Capacity shows the current state of the DD system, which is the same as the Capacity > Utilization page.

If insufficient data prevents an accurate projection, informational messages are displayed.

Table 1. Insufficient data messages
Message Description
Data is no longer being added to system. The used capacity is flat, so predictions are unreliable.
Projection cannot be made. The projection failed for unknown reasons.
Projection cannot be made because the average space used in the last 7 days is less than 10%. The system has so little data that the file system is less than 10% used. A projection cannot be made when such a small amount of capacity is used because it is unreliable.
Projection cannot be made because of insufficient data. A minimum of 15 daily space usage points is required for projections. At least 15 days of data is required to make a reliable projection.
Projection cannot be made because the space usage trend is not consistent during the specified date range. A regression was computed, and the slope is negative (that is, capacity is freeing up, not being consumed), and the fullness date is in the past.
Projection cannot be made because the space usage trend is not consistent during the specified date range.
  • The last measured usage point is below the confidence interval of the projection. The confidence interval is the 95% band, that is, for 95% of the time, the actual data points should be within the confidence interval. The most recently measured point is lower than the lowest value expected with 95% confidence.
  • A regression was computed, but the best regression does not match the actual measurements closely. Technically, this result indicates that the R2 value (the "coefficient of determination") is less than 0.8. [An R2 value of 1 means that a perfect fit was found. A value of 0 means that no correlation was found at all.] This R2 value means that capacity is not being used in a smooth, linear fashion. It is either being consumed at a varying rate or varying between being used and freed up. (See Space projection algorithm for DDMC for more about R2.)

Date column data (Current, and those selected using the timeline) can be sorted by amount of Used Space, Free Space, % Used, and Size in rising or descending order.

Highlighting a system in the list activates controls for interactively customizing the projection and launching the DD System Manager.

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