Dell Avamar best practices recommend a data mixture for optimal deduplication performance and capacity utilization. The ideal ratio is approximately 20% database data to 80% file system data. File system data typically contains high levels of redundancy and deduplicates very well. While Avamar can back up databases effectively, their data streams are often less redundant, especially if compressed or encrypted at the source. Adhering to this ratio helps ensure the system performs as expected and meets capacity projections. Exceeding this ratio significantly may require special sizing considerations.

A. 10:90 is an even more conservative ratio but not the standard best practice recommendation; the system can handle more database data than this.

C. 30:70 is sometimes considered an upper limit for database data but 20:80 is the more commonly cited best practice starting point.

D. 50:50 represents a very high proportion of database data that would likely lead to lower deduplication rates and require specific sizing adjustments.

1. Dell Avamar Operational Best Practices Guide, Page 11, Section "System Sizing and Data Profile". (Note: Specific document versions may vary, but this concept is consistently covered in sizing and best practice guides).

2. Dell Technologies Avamar Sizing Tool documentation often incorporates these ratios as default assumptions for mixed workloads.