SCSI架构模型SAM-5：技术草案与修订说明
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SCSI Architecture Model - 5 (SAM-5) 是由美国国家技术委员会 T10 发布的一项内部工作文档，该文档属于 T10 技术委员会针对信息技术标准的项目 T10/2104-D。此标准修订版为第5版，最后更新日期为2010年5月19日。作为未完成的标准，它并未获得正式批准，且内容可能会由 T10 技术委员会继续修改和完善，仅限于供审查和提供意见。
SCSI（Small Computer System Interface）是一种接口标准，用于连接计算机系统中的外设，如硬盘驱动器、光驱、磁带机等。SAM-5 架构模型是对 SCSI 系统的第五代设计，旨在定义和规范不同设备之间的交互方式、协议细节以及数据传输机制。它关注的核心内容可能包括：
1. **体系结构组件**：SAM-5 可能涵盖了接口控制器、适配器、物理层（如信号线和电缆）、逻辑单元（LU，负责执行命令和处理数据）、以及传输层（如帧格式和错误检测/纠正）等组成部分的功能定义和交互规范。
2. **命令集**：模型可能详述了各种SCSI命令，如标准命令、扩展命令以及专有命令，这些命令用于控制设备操作，比如读写数据、寻道、状态查询等。
3. **性能与效率**：SAM-5 可能会讨论如何提高数据传输速度、降低延迟、优化资源利用率，以及如何处理多任务环境下的并发请求。
4. **兼容性与扩展**：对于现有SCSI标准的兼容性，以及如何支持未来技术的发展，如更快的数据传输速率（如Ultra320 SCSI 或者 FC-AL），可能在模型中有所体现。
5. **安全与认证**：随着信息安全的重视，SAM-5 可能会涉及数据加密、身份验证和访问控制等安全措施。
6. **标准化过程**：由于文档是T10的工作草案，它强调了标准制定的开放性和透明度，允许成员和技术委员会的特定任务组在遵循版权规定的前提下复制和使用，但商业或盈利用途受到严格限制。
SCSI Architecture Model - 5 的核心目标是确保SCSI标准的稳定性和一致性，以便于设备制造商和系统集成商能够设计出兼容且高效的产品，同时适应不断发展的信息技术环境。该模型的详细内容对于理解SCSI技术的最新发展和实施至关重要。
T10/2104-D Revision 05 19 May 2010
xvi Working Draft SCSI Architecture Model - 5 (SAM-5)
Introduction
This standard is divided into the following clauses and annexes:
Clause 1 is the scope.
Clause 2 enumerates the normative references that apply to this standard.
Clause 3 describes the definitions, symbols, and abbreviations used in this standard.
Clause 4 describes the overall SCSI architectural model.
Clause 5 describes the SCSI command model element of the SCSI architecture.
Clause 6 describes the events that may be detected by a SCSI device.
Clause 7 describes the task management functions common to SCSI devices.
Clause 8 describes the task set management capabilities common to SCSI devices.
Annex A summarizes the identifier and name definitions of the SCSI transport protocols.
Annex B summarizes the SCSI Initiator Port attributes and SCSI Target Port attributes supported by SCSI
transport protocols.
Annex C lists the terminology differences between this standard and previous versions of this standard.
SCSI standards family
Figure 1 shows the relationship of this standard to the other standards and related projects in the SCSI family of
standards as of the publication of this standard.
Figure 1 — SCSI document structure
The SCSI document structure in figure 1 is intended to show the general applicability of the documents to one
another. Figure 1 is not intended to imply a relationship such as a hierarchy, protocol stack, or system
architecture.
The functional areas identified in figure 1 characterize the scope of standards within a group as follows:
SCSI Architecture Model: Defines the SCSI systems model, the functional partitioning of the SCSI standard set
and requirements applicable to all SCSI implementations and implementation standards.
Device-Type Specific Command Sets: Implementation standards that define specific device types including a
device model for each device type. These standards specify the required commands and behaviors that are
specific to a given device type and prescribe the requirements to be followed by a SCSI initiator device when
sending commands to a SCSI target device having the specific device type. The commands and behaviors for a
specific device type may include by reference commands and behaviors that are shared by all SCSI devices.
Shared Command Set: An implementation standard that defines a model for all SCSI device types. This
standard specifies the required commands and behavior that is common to all SCSI devices, regardless of
device type, and prescribes the requirements to be followed by a SCSI initiator device when sending commands
to any SCSI target device.
Device-type specific command sets
(e.g., SES-2, SMC-2, this standard)
Primary command set
(shared for all device types)
(SPC-4)
SCSI transport protocols
(e.g., SPL, FCP-4)
Interconnects
(e.g., SAS-2.1, Fibre Channel)
SCSI Architecture Model
(SAM-5)
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