Deduplication and Compression Design Considerations

Consider these guidelines when you configure deduplication and compression in a vSAN cluster.

• Deduplication and compression are available only on all-flash disk groups.
• On-disk format version 3.0 or later is required to support deduplication and compression.
• You must have a valid license to enable deduplication and compression on a cluster.
• When you enable deduplication and compression on a vSAN cluster, all disk groups participate in data reduction through deduplication and compression.
• vSAN can eliminate duplicate data blocks within each disk group, but not across disk groups.
• Capacity overhead for deduplication and compression is approximately five percent of total raw capacity.
• Policies must have either 0 percent or 100 percent object space reservations. Policies with 100 percent object space reservations are always honored, but can make deduplication and compression less efficient.