User Manual

SCSI Commands Reference Manual, Rev. J 28
www.seagate.com Definitions, Symbols, Abbreviations, Keywords, And Conventions
Internet protocol number
A coded value assigned to identify protocols that layer on the Internet protocol (see RFC 791). The Internet protocol number assigned to the
transmission control protocol (TCP, see RFC 793) is six. The Internet Assigned Numbers Authority maintains a list of Internet protocol number
assignments at http://www.iana.org/assignments/protocol-numbers.
Least significant bit (LSB)
In a binary code, the bit or bit position with the smallest numerical weighting in a group of bits that, when taken as a whole, represent a numer-
ical value (e.g., in the number 0001b, the bit that is set to one).
Left-aligned
A type of field containing ASCII data in which unused bytes are placed at the end of the field (highest offset) and are filled with ASCII space
(20h) characters.
Logical block
A set of data bytes accessed and referenced as a unit.
Logical block address (LBA)
The value used to reference a logical block.
Logical unit
An externally addressable entity within a SCSI target device that implements a SCSI device model and contains a device server. A detailed defi-
nition of a logical unit may be found in SAM-5.
Logical unit access control descriptor (LUACD)
The structure within an ACE that identifies a logical unit to which access is allowed and specifies the LUN by which the logical unit is to be
accessed.
Logical unit certification list (CLIST)
Defects detected by the device server during an optional certification process performed during the FORMAT UNIT command.
Logical unit inventory
The list of the logical unit numbers reported by a REPORT LUNS command.
Logical unit number (LUN)
An encoded 64-bit identifier for a logical unit. A detailed definition of a logical unit number may be found in SAM-5.
Logical unit reset
A condition resulting from the events defined by SAM-5 in which the logical unit performs the logical unit reset operations described in SAM-5,
SPC-5, and the applicable command standards.
Media
Plural of Medium
Medium
A physical entity that stores data in a nonvolatile manner (i.e., retained through a power cycle) in accordance with commands processed by the
device server.
Medium auxiliary memory (MAM)
An auxiliary memory residing on a medium that is accessible to the device server (e.g., a tape cartridge). Medium auxiliary memory may be
nonvolatile and independent of the main function of the device server.
Most significant bit (MSB)
In a binary code, the bit or bit position with the largest numerical weighting in a group of bits that, when taken as a whole, represent a numer-
ical value (e.g., in the number 1000b, the bit that is set to one).
Name
A label of an object that is unique within a specified context and should never change (e.g., the term name and worldwide identifier (WWID)
may be interchangeable).
Network address authority (NAA)
A field within a name that specifies the format and length of that name. See FC-FS.
Nexus
A relationship between two SCSI devices, and the SCSI initiator port and SCSI target port objects within those SCSI devices.
Non-volatile cache
Cache that retains data through power cycles.
Non-volatile cache memory