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A glossary of storage networking, data, and information management terminology. To learn more about the SNIA Dictionary click here.

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reserved (field)

1. In a standard, a field in a data structure set aside for future definition.

   Some standards prescribe implementation behavior with respect to reserved fields (e.g., originators of data structures containing reserved fields must zero fill them; consumers of data structures containing reserved fields must ignore them, etc.); others do not.

2. A field filled with binary zeros by a source N-Port and ignored by a destination N-Port.

   Each bit in a reserved field is denoted by "r" in the Fibre Channel standards. Future enhancements to Fibre Channel Standards may define usages for reserved fields. Implementations should not check or interpret reserved fields. Violation of this guideline may result in loss of compatibility with future implementations that comply with future enhancements to Fibre Channel Standards.

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