The Dell XtremIO X2 Storage Array uses an inline data deduplication process which involves

fingerprinting data blocks. The fingerprinting process is a part of the data reduction technique that

helps in identifying duplicate data blocks. When data enters the system, it is divided into small

chunks, and each chunk is fingerprinted using a hashing algorithm. The size of the fingerprint is

crucial as it determines the efficiency and accuracy of the deduplication process.

The specific bit size of the fingerprint created by the algorithm used by XtremIO is 256 bits. This

information is derived from the detailed descriptions of the system’s architecture and operation as

provided in the Dell EMC XtremIO X2 Storage Array documentation1. The document outlines the

system features, including inline data reduction techniques like deduplication and compression,

which are essential components of XtremIO’s data management capabilities.

The 256-bit fingerprint size ensures a balance between deduplication efficiency and the probability

of hash collisions (where different data blocks could result in the same fingerprint). A larger

fingerprint size would reduce the chance of collisions but would require more storage space for

metadata, while a smaller size would save metadata space but increase the risk of collisions.

Therefore, the 256-bit size is a strategic choice for the XtremIO system’s deduplication process.

In summary, the fingerprint bit size for XtremIO’s deduplication algorithm is 256 bits, which is

designed to optimize the system’s performance and data reduction capabilities while maintaining

data integrity.