ISO/IEC 14776-321:2002 PDF
Information technology — Small Computer System Interface-3 (SCSI-3) — Part 321: SCSI-3 Block Commands (SBC)
Information technology — Small Computer System Interface-3 (SCSI-3) — Part 321: SCSI-3 Block Commands (SBC)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 132
- Дата публикации:
- 26 сентября 2002 г.
- Издание:
- ISO/IEC IS 14776 edition 1 version 1
- ICS:
- 35.200
This part of ISO/IEC 14776 defines the command set extensions to facilitate operation of SCSI block devices. It specifies the functional requirements for the SCSI-Block Command set (SBC). SBC permits that SCSI block logical units, such as flexible disks, rigid disks, optical disks, etc. be attached to computers, and it provides the definition for their use. This standard defines a logical unit model for SCSI block logical units. Also defined are SCSI commands that apply to SCSI block logical units. The clause(s) of this standard pertaining to the SCSI block device class, implemented in conjunction with the applicable clauses of ISO/IEC 14776-311, fully specify the standard command set for SCSI block devices. The objectives of this standard are the following: a) permit an application client to communicate with a logical unit that declares itself to be a direct-access device, write-once device and optical memory device in the device type field of the INQUIRY command response data over an SCSI service delivery subsystem; b) define commands unique to the type of SCSI block devices; c) define commands to manage the operation of SCSI block devices; d) define the differences between types of SCSI block devices. Figure 1 ? SCSI standards ? General structure Figure 1 shows the general structure of SCSI standards. The figure does not imply a relationship such as a hierarchy, protocol stack, or system architecture. It indicates the applicability of a standard to the implementation of a given transport.
Abstract
Overview
ISO/IEC 14776-321:2002 - "Information technology - Small Computer System Interface‑3 (SCSI‑3) - Part 321: Block commands (SBC)" defines the SCSI‑3 block command set (SBC) and the logical unit model for SCSI block devices. The standard specifies command set extensions and functional requirements that allow SCSI block logical units - such as flexible disks, rigid disks, optical disks and write‑once media - to be attached to computers and managed over an SCSI service delivery subsystem.
Key topics and technical requirements
- Logical unit models for direct‑access devices, optical memory devices and write‑once devices, including handling of removable media, logical blocks, ready and power states, initialization, and defect management.
- Command definitions for block devices: FORMAT UNIT, READ (6/10/12), WRITE (6/10/12), READ CAPACITY, READ DEFECT DATA, REASSIGN BLOCKS, VERIFY, SYNCHRONIZE CACHE, ERASE, UPDATE BLOCK, and specialized commands (e.g., READ LONG, WRITE LONG, WRITE SAME).
- Device management and operation commands to control caching, locking, prefetch, start/stop unit and power condition behaviors.
- Error reporting and defect handling, including defect lists and parameters tailored to different block device types.
- Advanced operations such as XOR/regenerate/rebuild examples for array or subsystem‑level operations (annex material).
- Parameters and mode pages that define diagnostic, log and operational parameters for block devices.
Practical applications
- Implementation guidance for storage device firmware and SCSI target/lun software stacks to ensure compatibility with SCSI‑3 block devices.
- Reference for device manufacturers creating direct‑access (HDD/SSD), optical and write‑once media that must support standard SCSI block commands.
- Basis for storage array controllers, SAN/NAS firmware, OS device drivers and virtualization hypervisors that issue SCSI block commands and manage logical units.
- Useful for QA, interoperability testing and certification of SCSI‑compliant block devices and subsystems.
Who uses it:
- Storage hardware engineers, firmware developers, system integrators, OS and driver developers, test labs, and procurement/specification teams specifying SCSI block device behavior.
Related standards
- ISO/IEC 14776‑311 (transport and services clauses referenced for block device implementation) and other SCSI family standards that define the general SCSI architecture and transports.
Keywords: ISO/IEC 14776-321, SCSI‑3, SBC, SCSI block commands, block devices, direct‑access device, optical memory, write‑once, READ/WRITE, FORMAT UNIT.
Технические детали
- Технический комитет
- ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
- SKU
- ISO/IEC 14776-321:2002
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