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.
Prerequisites
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. If the Storage Manager Client is connected to a Data Collector, select a Storage Center from the Storage view.
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 Profile 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 effectively 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 Efficiency Ratio show the data savings on the Storage Center using the available
disk space-saving features.
System Data Reduction Ratio – Ratio that compares the amount of space that would be 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 Efficiency Ratio – Ratio that indicates the efficiency 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.
Steps
1. If the Storage Manager Client is connected to a Data Collector, select a Storage Center from the Storage view.
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.
5. Select a storage type.
The space saved by data reduction is displayed in the Data Reduction Savings section.
128
Storage Center Administration