Dell Storage Manager 2020 R1 Administrator's 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.