SCSI Primary Commands - 2.pdf

18 July 2001 T10/1236-D Revision 20American National StandardAmerican National Standard for Information Systems -Information Technology -SCSI Primary Commands - 2 (SPC-2)NCITS.351:200x1 ScopeThe SCSI family of standards provides for many different types of SCSI devices (disks, tapes, printers, scanners,and many more). This standard defines a device model that is applicable to all SCSI devices. Other SCSIcommand standards (see 3.1.12) expand on the general SCSI device model in ways appropriate to specific typesof SCSI devices.The set of SCSI standards specifies the interfaces, functions, and operations necessary to ensure interoperabilitybetween conforming SCSI implementations. This standard is a functional description. Conforming implementationsmay employ any design technique that does not violate interoperability.This standard defines the SCSI commands that are mandatory and optional for all SCSI devices. This standardalso defines the SCSI commands that may apply to any device model.Since a host processor is a part of any SCSI domain, the processor device model is defined in this standard. Thecommands that may be implemented by a SCSI processor device likewise are defined in this standard. Sometarget SCSI devices may implement an initiator subset of the processor device model to support the AsynchronousEvent Reporting capability defined in the SCSI-3 Architecture Model.Figure 1 shows the relationship of this standard to the other standards and related projects in the SCSI family ofstandards as of the publication of this standard.Common Access MethodDevice-Type Specific Command SetsArchitecture ModelShared Command Set (for all device types)Transport ProtocolsPhysical InterconnectsFigure 1 — SCSI document relationshipsdpANS SCSI Primary Commands - 2 (SPC-2) 1