XAM (eXtensible Access Method) definition

Contributor(s): Kim Hefner

XAM (eXtensible Access Method) is a standard that makes it easier to manage fixed data by freeing data from dependencies on location, applications and storage devices.

Created by the Storage Networking Industry Association (SNIA), XAM facilitates the exchange of data among content-addressed storage (CAS) systems, which store archive and compliance data (often in an immutable form). XAM assigns a unique identifier (UID) and user-defined metadata to each object. Because the metadata never changes, content can still be identified if it is migrated or even moved to another system.

The XAM standard is composed of three sections:

  • XAM Part 1: Architecture. Document used by application programmers using the XAM application program interface (API) to create, access, manage and query reference content, as well as by storage system vendors creating vendor interface modules (VIMs) that translate XAM requests into device-specific action.
  • XAM Part 2: C API. Reference document for C application development using the XAM API.
  • XAM Part 3: Java API. Reference document for Java application development using the XAM API.

See also: object storage

This was first published in September 2013

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