Administrator Guide

Deduplication
Deduplication reduces the space used by a volume by identifying and deleting duplicate pages. Deduplication requires SSD drives.
Apply Deduplication With Compression to a Volume
Apply Deduplication with Compression to reduce the size of the volume. Deduplication and compression run during daily Data
Progression.
Prerequisite
Allow Data Reduction Selection must be enabled in the Preferences tab of the Edit Storage Center Settings dialog box.
About this task
NOTE: The amount of space saved by Data Reduction is determined by the amount of data eligible for Data Reduction on
the volume compared to the total amount of space used by that data on disk after Data Reduction.
Steps
1. Select a Storage Center from the Storage view. (Data Collector connected Storage Manager Client only)
2. Click the Storage tab.
3. In the Storage tab navigation pane, select a volume.
4. In the right pane, click Edit Settings. The Edit Volume dialog box opens.
5. From the Data Reduction Prole drop-down menu, select Deduplication with Compression.
View Amount of Space Saved by Data Reduction
The total amount of space saved by Data Reduction depends on the amount of data eligible for Data Reduction and the type of data
being processed. Certain types of data will be reduced more eectively than others. The amount of volume data eligible for Data
Reduction is determined by the size of the data frozen by snapshots, and the Data Reduction Input setting.
Data Savings Ratios
System Data Reduction Ratio and System Data Eciency Ratio show the data savings on the Storage Center using the available disk
space-saving features.
System Data Reduction Ratio
Compares the amount of space that would used by pages that are eligible for compression and deduplication to the amount of space
actually used by those pages after Storage Center applies Data Reduction.
System Data Eciency Ratio
Indicates the eciency of compression, deduplication, RAID, and Thin Provisioning
View Amount of Space Saved for a Storage Type
Storage Center determines the total percentage of space saved for all volumes in a Storage Type by comparing the amount of space
processed by Data Reduction to the amount of space used after Data Reduction.
1. Select a Storage Center from the Storage view. (Data Collector connected Storage Manager Client only)
2. Click the Storage tab.
3. In the Storage tab navigation pane, expand Storage Types.
4. Select a Storage Type. The space saved by Data Reduction is displayed at the bottom of the Summary tab.
View Amount of Space Saved by Data Reduction on a Volume
The percentage of space saved by Data Reduction for a volume is an estimate found by comparing the total amount of space saved
by compression and deduplication with the total amount of space processed by Data Reduction in the volume.
1. Select a Storage Center from the Storage view. (Data Collector connected Storage Manager Client only)
2. Click the Storage tab.
Storage Center Administration
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