What are three types of Dell Avamar hashes?

Dell Avamar utilizes a three-tiered hierarchical hashing system to achieve its data deduplication. The three types of hashes are: Atomic, Composite, and Root. An Atomic hash represents an individual data chunk. A Composite hash is a hash of a group of atomic hashes. Finally, a single Root hash is generated from all the composite hashes for a file, serving as a unique identifier for that specific version of the file.

B. Index: An index is a data structure used for fast data retrieval; it is not a type of hash used in the Avamar deduplication process.
C. Stripe: A stripe is a data layout concept used in RAIN (Redundant Array of Independent Nodes) for data distribution, not a hash type.
D. Parity: Parity is data used for fault tolerance in RAID and RAIN systems to reconstruct lost data; it is not a hash for data identification.

- Dell EMC Avamar Technical Fundamentals Student Guide, Module 2: Avamar Concepts and Terminology, Section: "Avamar Deduplication Process". This source clearly outlines the three hash types: atomic, composite, and root.

- Dell Avamar 19.4 Administration Guide, Page 51, "Backup process overview". The description of the backup process implicitly covers the hierarchy from data chunks to the final file hash.