User Manual

SCSI Commands Reference Manual, Rev. J 29
www.seagate.com Definitions, Symbols, Abbreviations, Keywords, And Conventions
Cache memory that retains data through power cycles.
Non-volatile medium
A physical storage medium that retains data written to it for subsequent read operations through power cycles (e.g., a disk within a device that
stores data as magnetic field changes that do not require device power to exist).
Null-padded
A type of field in which unused bytes are placed at the end of the field (i.e., highest offset) and are filled with ASCII null (00h) characters.
Null-terminated
A type of field in which the last used byte (i.e., highest offset) is required to contain an ASCII null (00h) character.
One
The logical true condition of a variable.
Operation Code
The first byte of a SCSI CDB shall contain an operation code identifying the operation being requested by the CDB.
Organizationally unique identifier (OUI)
A numeric identifier that is assigned by the IEEE such that no assigned identifiers are identical. OUI is equivalent to company_id or IEEE compa-
ny_id. The IEEE prefers OUI for EUI-48 identifiers and company_id for EUI-64 identifiers. However, the numeric identifier is called an OUI when it
is assigned by the IEEE. The IEEE maintains a tutorial describing the OUI at http://standards.ieee.org/re
gauth/oui/.
Page
A regular parameter structure (or format) used by several commands. These pages are identified with a value known as a page code.
Persist through power loss
An optional capability associated with some features that allows an application client to request that a device server maintain information
regarding that feature across power failures.
Persistent reservation holder
The I_T nexus(es) that are allowed to release or change a persistent reservation without preempting it.
Power cycle
Power being removed from and later applied to a SCSI device.
Power on
A condition resulting from the events defined by SAM-5 in which the SCSI device performs the power on operations described in SAM-5, SPC-5,
and the applicable command standards.
Primary defect list (PLIST)
The list of defects that are considered permanent defects.
Protection information
Fields appended to each logical block that contain a cyclic redundancy check (CRC), an application tag, and a reference tag.
Protocol identifier
A coded value used in various fields to identify the protocol to which other fields apply.
Protocol specific
A requirement that is defined by a SCSI transport protocol standard. A detailed definition of protocol specific may be found in SAM-5.
Protocol standard
A SCSI standard that defines SCSI transport protocol (e.g., SAS, SBP-3, or FCP-2).
Proxy token
An identifier for a logical unit that may be used to gain temporary access to that logical unit in the presence of access controls.
Redundancy group
A grouping of XOR-protected data and associated check data into a single type of data redundancy (see SCC-2). SPC-5 only supports the XOR
type of redundancy.
Request for comment (RFC)
The name given to standards developed by the Internet Engineering Task Force.