Administrator Guide

FluidFS v6.0 or later FluidFS v5.0 or earlier
The distributed dictionary service detects when it reaches almost
full capacity and doubles in size (depending on available system
storage).
The dictionary size is static and limits the amount of unique data
referenced by the optimization engine.
Date Reduction Age-Based Policies and Archive Mode
By default, data reduction is applied only to files that have not been accessed or modified for 30 days to minimize the impact of data
reduction processing on performance. The number of days after which data reduction is applied to files is configurable using Storage
Manager.
The default number of days is set to 30. When using FluidFS v5 or earlier, you can change the default to as low as 5 days, and you can
start data reduction processing immediately (archive mode). Starting with FluidFS v6, there is no archive mode available. You can set the
Exclude Files Accessed in the Last and Exclude Files Modified in the Last defaults to 1 day instead of using archive mode.
For more information about enabling and disabling archive mode, see the Dell FluidFS FS8600 Appliance CLI Reference Guide.
Data Reduction Considerations
Consider the following factors when enabling data reduction:
• Data reduction processing has a 5-20% impact on the performance of read operations on reduced data. It does not have any impact
on write operations or read operations on normal data.
• The new (reduced) data and metadata is written to the highest tier in the respective Storage Profile of the FluidFS LUNs. Standard
data progression process is then applied.
• Increased internal traffic during data reduction processing.
• Data is rehydrated for antivirus scanning.
• Data is rehydrated before being replicated to a target NAS volume. If replication is already configured, the data being reduced was
already replicated
• You cannot enable data reduction on a clone NAS volume.
• Data reduction stops automatically when a NAS volume has less than 5 GB of unused space. Therefore, a NAS volume resize can
inadvertently stop data reduction.
Configuring Data Reduction
Data reduction must be enabled at the system level and configured on a per NAS volume basis.
Enable or Disable Data Reduction on the FluidFS Cluster
Data reduction must be enabled at the system level before it will run on NAS volumes on which data reduction is enabled. To minimize the
impact of data reduction processing on system performance, schedule data reduction to run during off-peak times.
Steps
1. In the Storage view, select a FluidFS cluster.
2. Click the File System tab.
3. In the File System view, NAS Pool Advanced Status area, click Edit Data Reduction Settings.
The Edit Data Reduction Settings dialog box opens.
4. Enable or disable data reduction on the FluidFS cluster:
• To enable data reduction on the FluidFS cluster, select the Enable Data Reduction Optimization checkbox.
• To disable data reduction on the FluidFS cluster, clear the Enable Data Reduction Optimization checkbox.
5. Enter the Data Reduction Optimization Start Time.
6. Enter the number of hours to run data reduction in the Data Reduction Optimization Runtimefield.
7. Click OK.
Enable Data Reduction on a NAS Volume
Data reduction is enabled on a per NAS volume basis.
Prerequisites
Data reduction must be enabled at the system level before it can run on individual NAS volumes.
FluidFS Administration
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