Administrator Guide

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 you are connected to a Data Collector, select a Storage Center from the drop-down list in the left navigation pane of
Unisphere Central.
2.
From the STORAGE menu, click Storage Types.
The Storage Types view is displayed.
3. Select a storage type.
The space saved by data reduction is displayed in the Data Reduction Savings section.
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.
Steps
1. If you are connected to a Data Collector, select a Storage Center from the drop-down list in the left navigation pane of
Unisphere Central.
2.
From the
STORAGE menu, click Volumes.
The Volumes view is displayed.
3. In the Volumes view, select the volume you want to view.
4. Click the Tiering tab. The amount of space saved by data reduction on that volume is displayed at the bottom of the
Tiering page.
Change the Default Data Reduction Profile
The default Data Reduction profile determines the type of data reduction that is applied to new volumes.
Steps
1. If you are connected to a Data Collector, select a Storage Center from the drop-down list in the left navigation pane of
Unisphere Central.
2. In the Summary view, click
(Settings).
The Edit Storage Center Settings dialog box opens.
3. Click the Preferences tab.
4. From the Data Reduction Profile drop-down list, select the default profile for new volumes.
● Select Compression to apply compression to new volumes.
● Select Deduplication with Compression to apply deduplication and compression to new volumes.
NOTE:
Selecting the Allow Data Reduction Selection checkbox enables users to select the data reduction option to
apply to a volume.
86 Storage Center Administration