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Dell PowerStore Configuring Volumes

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Volume Capacity

You can view capacity metrics for individual volumes from Storage > Volumes > [volume] > Capacity.

Collection frequency and retention periods

Capacity metrics are collected at 5 minute intervals and rolled up to 1 hour and 1 day aggregates. The data is retained as follows:

  • 5 minute data is retained for 1 day.
  • 1 hour data is retained for 30 days
  • 24 hour data is retained for 2 years.

Usage

The Usage area displays the current capacity and data efficiency metrics for the volume.

NOTE:PowerStore Manager displays all capacities in base 2 by default. Hovering over the Percentage Used, Free, and Provisioned values at the top of Capacity tab displays a tooltip that shows the values in both base 2 and base 10. For more information, see Dell Knowledge Base Article 000188491: PowerStore: How PowerStore physical capacity is calculated.
Table 1. Current volume capacity metrics Metrics displayed in the Usage area of the Capacity card
Metric Description
Used Amount of data that is written to the volume. The doughnut chart displays the Used metric as a percentage of the total provisioned capacity.
NOTE:This metric does not include space saving from data sharing within the volume family or data reduction.
Free Amount of data can be written to the volume.
Thin Savings The ratio of logical space provisioned for the volume family to logical space used by the volume family. This value shows the space savings that are achieved by using thin provisioning.
Snap Savings The ratio is calculated by dividing the capacity that would have been required for fully provisioned copies of a volume or clone by the actual capacity that is used by the snapshots and clones of the primary volume or clone. This calculation shows the efficiency that is gained by using snapshots and clones. It does not include data reduction savings.
Snapshot/Thin Clone Space Amount of data that is written to snapshots and clones of this volume.
Volume Family Unique Data Physical space that is used by the volume family after deduplication and data sharing savings are applied. This metric is useful for determining the amount of space that is freed if the primary volume and any clones are deleted.

Historical Usage

The Historical Usage area displays the capacity metrics for the selected time period.
Table 2. Historical volume capacity metrics Metrics displayed in the Historical Usage area of the Capacity card
Metric Description
Provisioned Total amount of data can be written to a volume as it was created.
Used Amount of data that is written to the volume.
The Historical Usage chart shows the date and time along the x-axis against the usage along the y-axis. To interact with this chart:
  • Select the time period.
  • Hover over a data point in the chart to display the metric value at that point-in-time.
  • Zoom in on a time period by moving the ends of the line chart. Click Reset zoom to reset the chart.
  • Print or download the data from the chart by selecting an option on the chart menu. This is located on the top-right corner of the chart.

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