Administrator Guide

NOTE: The status of the lter is listed as File filters….disabled if the ignore-lters option was set through the
CLI. If the status is File filters…disabled, any lters that have been congured through the GUI (or CLI) for
Access Time or Modify Time have been disabled and all les are candidates for data reduction. Specifying the ignore-
filters ag enables data reduction on a container with archive data without waiting for the minimum Access Time/
Modify Time data-reduction policy. Dell recommends that you not use this setting on containers with live data. That is,
you should use this setting only on containers with archive data.
Data Reduction Policy
A data reduction policy denes which les qualify for data reduction and what type of data reduction should be performed.
The policy is based on:
• Access Time — The last day that the le was open for reading. (The lter is based on the number of days and not a specic
time.)
• Modication Time — The last day that the le was changed. (The lter is based on the number of days and not a specic time.)
• Compression — Perform le compression, in addition to deduplication. Use compression with text les to increase storage space
eciency. Compression does not increase storage space eciency with binary les, such as audio and video les. Deduplication,
which is enabled whenever data reduction is enabled, increases disk storage space utilization eciency with both text and binary
les.
Modify Container Data Reduction Policy
1. Click NAS, expand NAS Clusters and Local Containers, and then select the NAS container name.
2. In the Activities panel, click Modify settings to open the dialog box.
3. Click the Data Reduction tab.
4. Select the Enable data reduction checkbox.
5. Click the Modify policy button.
6. (Optional) To perform compression as well as deduplication, select the Enable compression checkbox.
7. To change the access time required for data reduction, enter a new value in Access Time. After modifying the access time,
click the Save icon to save the changes. The access time is the minimum number of days that must pass since the le was last
accessed before the le is eligible for data reduction. This value must be in the range of 30 to 365 days if compression is
enabled. If compression is disabled, the range is 5 to 365 days. By default, this value is 30 days.
8. To change the modication time required for data reduction, enter a new value in Modify Time. After modifying the modify
time, click the Save icon to save the changes. The modify time is the minimum number of days that must pass since the le
was last modied before the le is eligible for data reduction. This value must be in the range of 30 to 365 days if compression
is enabled. If compression is disabled, the range is 5 to 365 days. By default, this value is 30 days.
9. Click OK.
NOTE: The status of the lter is listed as File filters….disabled if the ignore-filters option was set through
the CLI. If the status is File filters…disabled, any lters that have been congured through the GUI (or CLI) for
Access Time or Modify Time have been disabled and all les are candidates for data reduction. Specifying the
ignore-
filters ag enables data reduction on a container with archive data without waiting for the minimum Access Time/
Modify Time data-reduction policy. Dell recommends that you not use this setting on containers with live data. That is,
you should use this setting only on containers with archive data.
Modify Default Data Reduction Policy
The default data reduction policy sets the access time and modify time values that are used by default when you enable data
reduction on a container.
To modify the default data reduction policy:
1. Click Group, expand Group Conguration, and select a NAS cluster.
2. Click the Data Reduction tab.
3. Modify the settings on the Default Data Reduction Policy panel as needed:
• In Access Time, enter a value. After modifying the access time, click the Save icon to save the changes. The access time is
the minimum number of days that must pass since the le was last accessed before the le is eligible for data reduction.
NAS Container Operations
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