SCSI-3 Block Commands - SBC2 Standard Draft

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"SCSI-3 Block Command SBC2 Set是SCSI（Small Computer System Interface）标准的一个修订版，属于T10/1417-D项目的一部分，由美国国家标准协会（American National Standards）下的T10技术委员会进行制定。这个工作草案在2004年11月13日的第16次修订中发布，主要用于信息处理技术领域的SCSI块命令。SBC-2（SCSIBlockCommands-2）是SCSI-3的一个子集，专注于块设备的控制与通信。" SCSI是一种广泛使用的接口标准，允许计算机与其他设备如硬盘、光驱、磁带驱动器等进行高速数据传输。SCSI-3 Block Command SBC2 Set主要关注如何有效地执行针对块设备的操作，例如读写操作，以及管理和优化存储系统的性能。在这个文档中，我们可以预期会涵盖以下关键知识点： 1. **SCSI协议的演进**：SCSI从早期的版本发展到SCSI-3，带来了更快的数据传输速率、更复杂的错误处理机制和更高效的命令集。 2. **SBC-2命令集**：SBC2是SCSI-3中的一个核心组件，定义了如何与块设备进行交互，包括读取、写入和定位数据块的指令。 3. **块设备操作**：文档可能详细描述了如何使用SBC-2命令来执行I/O操作，如启动、停止、读写请求、队列管理等。 4. **错误处理和恢复**：SCSI协议提供了一套完善的错误报告和恢复机制，确保在出现问题时能可靠地恢复操作。 5. **多任务并发**：SCSI-3支持多个命令同时进行，提高了系统吞吐量，这在SBC2中也会有所体现。 6. **性能优化**：SBC2可能包含了关于如何通过预读、写后读等策略来提升存储性能的指导。 7. **技术编辑与联系人信息**：文档的技术编辑是Robert C. Elliott，来自惠普公司，负责协调和更新标准的工作。值得注意的是，这个文档作为工作草案，并未正式批准为标准，因此其内容可能会随着T10技术委员会的讨论和反馈而变化。它仅供INCITS及其技术委员会和相关任务组内部用于标准化活动的审查和评论，商业或营利性复制是被严格禁止的。

T10/1417-D Revision 16 13 November 2004

2 Working Draft SCSI Block Commands - 2 (SBC-2)

h) third-party XOR operation and hybrid XOR operation model, commands (the REBUILD,

REGENERATE, and XDWRITE EXTENDED commands), and mode page fields (the XOR Control

mode page

MAXIMUM REGENERATE SIZE field, MAXIMUM REBUILD TRANSFER SIZE field, and REBUILD DELAY

field;

i) the following mode pages and mode page fields:

A) the Caching mode page

NON CACHE SEGMENT SIZE field;

B) the Flexible Disk mode page;

C) the Format Device mode page;

D) the Medium Types Supported mode page and all medium types in the mode parameter header;

E) the Notch and Partition mode page;

F) the following Read-Write Error Recovery mode page fields: the

CORRECTION SPAN field, the HEAD

OFFSET COUNT field, and the DATA STROBE OFFSET COUNT field;

G) the Rigid Disk Geometry mode page; and

H) the Verify Error Recovery mode page

VERIFY CORRECTION SPAN field;

j) the Device Status Output and Device Status Input diagnostic pages;

k) the

DISABLE SAVING PARAMETERS (DSP) bit in the FORMAT UNIT parameter list;

l) the

INTERLEAVE field in the FORMAT UNIT command; and

m) the erase by-pass (

EBP) bit in the WRITE and WRITE AND VERIFY commands. This bit was formerly

reserved for the direct-access block device type, so is just marked reserved in this standard.

13 November 2004 T10/1417-D Revision 16

Working Draft SCSI Block Commands - 2 (SBC-2) 3

2 Normative References

2.1 Normative references overview

The following standards contain provisions that, by reference in the text, constitute provisions of this standard.

At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to

agreements based on this standard are encouraged to investigate the possibility of applying the most recent

editions of the standards listed below.

Copies of the following documents may be obtained from ANSI:

a) approved ANSI standards;

b) approved and draft international and regional standards (e.g., ISO, IEC, CEN/CENELEC, ITU-T); and

c) approved and draft foreign standards (e.g., BSI, JIS, and DIN).

For further information, contact ANSI Customer Service Department at 212-642-4900 (phone), 212-302-1286

(fax) or via the World Wide Web at http://www.ansi.org.

Additional availability contact information is provided below as needed.

Table 1 lists standards bodies and their web sites.

2.2 Approved references

At the time of publication, the following referenced standards were approved.

ISO/IEC 14776-342, SCSI-3 Controller Commands - 2 (SCC-2)(ANSI INCITS 318-1998)

Table 1 — Standards bodies

Abbreviation Standards body Web site

ANSI American National Standards Institute http://www.ansi.org

BSI British Standards Institution http://www.bsi-global.com

CEN European Committee for Standardization http://www.cenorm.be

CENELEC

European Committee for Electrotechnical

Standardization

http://www.cenelec.org

DIN German Institute for Standardization http://www.din.de

IEC International Engineering Consortium http://www.iec.ch

IEEE Institute of Electrical and Electronics Engineers http://www.ieee.org

INCITS

International Committee for Information Technology

Standards

http://www.incits.org

ISO International Standards Organization http://www.iso.ch

ITI Information Technology Industry Council http://www.itic.org

ITU-T

International Telecommunications Union

Telecommunications Standardization Sector

http://www.itu.int

JIS Japanese Industrial Standards Committee http://www.jisc.org

T10 INCITS T10 Committee - SCSI storage interfaces http://www.t10.org

T11 INCITS T11 Committee - Fibre Channel interfaces http://www.t11.org

T13 INCITS T13 Committee - ATA storage interface http://www.t13.org

13 November 2004 T10/1417-D Revision 16

Working Draft SCSI Block Commands - 2 (SBC-2) 5

3 Definitions, symbols, abbreviations, keywords, and conventions

3.1 Definitions

3.1.1 additional sense code: A combination of the ADDITIONAL SENSE CODE and ADDITIONAL SENSE CODE

QUALIFIER fields in the sense data. See SPC-3.

3.1.2 application client: An object that is the source of SCSI commands. See SAM-3.

3.1.3 byte: A sequence of eight contiguous bits considered as a unit.

3.1.4 cache: A temporary and often volatile data storage area outside the area accessible by application

clients that may contain a subset of the data stored in the non-volatile data storage area.

3.1.5 check data: Information contained within a redundancy group (see 3.1.37) that may allow lost or

destroyed XOR-protected data (see 3.1.46) to be recreated.

3.1.6 command: A request describing a unit of work to be performed by a device server. See SAM-3.

3.1.7 command descriptor block (CDB): The structure used to communicate commands from an

application client to a device server. See SPC-3.

3.1.8 cyclic redundancy check (CRC): An error checking mechanism that checks data integrity by

computing a polynomial algorithm based checksum. See 4.16.3.

3.1.9 data defect list (DLIST): A list of defects sent by the application client to the device server during a

FORMAT UNIT command. See 4.8.

3.1.10 data-in buffer: The buffer identified by the application client to receive data from the device server

during the processing of a command. See SAM-3.

3.1.11 data-out buffer: The buffer identified by the application client to supply data that is sent from the

application client to the device server during the processing of a command. See SAM-3.

3.1.12 default protection information: Values placed into protection information fields if an application

client does not specify specific protection information values.

3.1.13 device server: An object within a logical unit that processes SCSI tasks according to the rules of task

management. See SAM-3.

3.1.14 device type: The type of device (or device model) implemented by the device server as indicated by

the

PERIPHERAL DEVICE TYPE field of the standard INQUIRY data. See SPC-3.

3.1.15 direct-access block device: A device that is capable of containing data stored in blocks that each

have a unique logical block address.

3.1.16 domain: An I/O system consisting of a set of SCSI devices that interact with one another by means of

a service delivery subsystem. See SAM-3.

3.1.17 error correcting code (ECC): An error checking mechanism that checks data integrity and enables

some errors in the data to be corrected.

3.1.18 exclusive-or (XOR): A Boolean arithmetic function on two binary input values that results in an output

value of 1 if one and only one of the input values is 1.

T10/1417-D Revision 16 13 November 2004

6 Working Draft SCSI Block Commands - 2 (SBC-2)

3.1.19 extent: A fixed set of logical blocks occupying contiguous logical block addresses on a single logical

unit.

3.1.20 field: A group of one or more contiguous bits, a part of a larger structure such as a CDB (see 3.1.7) or

sense data (see SPC-3).

3.1.21 format corrupt: a vendor-specific condition in which the application client may not be able to perform

read operations, write operations, or verify operations. See 4.6.

3.1.22 grown defect list (GLIST): All defects sent by the application client to the device server. See 4.8.

3.1.23 hard reset: A condition resulting from the events defined by SAM-3 in which the SCSI device

performs the hard reset operations described in SAM-3, this standard, and other applicable command

standards (see table 10 in 5.1).

3.1.24 I_T nexus loss: A condition resulting from the events defined by SAM-3 in which the SCSI device

performs the I_T nexus loss operations described in SAM-3, this standard, and other applicable command

standards (see table 10 in 5.1).

3.1.25 logical block: A set of data bytes accessed and referenced as a unit.

3.1.26 logical block address (LBA): The value used to reference a logical block.

3.1.27 logical unit certification list (CLIST): Defects detected by the device server during an optional

certification process performed during the FORMAT UNIT command. See 4.8.

3.1.28 logical unit reset: A condition resulting from the events defined by SAM-3 in which the logical unit

performs the logical unit reset operations described in SAM-3, this standard, and other applicable command

standards (see table 10 in 5.1).

3.1.29 media: Plural of medium.

3.1.30 medium: The material on which data is stored (e.g., a magnetic disk).

3.1.31 non-volatile cache: Cache that retains data through power cycles.

3.1.32 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).

3.1.33 power cycle: Power being removed followed by power being applied to a SCSI device.

3.1.34 power on: A condition resulting from the events defined by SAM-3 in which the SCSI device performs

the power on operations described in SAM-3, this standard, and other applicable command standards (see

table 10 in 5.1).

3.1.35 primary defect list (PLIST): The list of defects that are considered permanent defects. See 4.8.

3.1.36 protection information: Fields appended to each logical block that contain a cyclic redundancy

check (CRC), an application tag, and a reference tag.

3.1.37 redundancy group: A grouping of XOR-protected data (see 3.1.46) and associated check data (see

3.1.5) into a single type of data redundancy (see SCC-2). This standard only supports the XOR (see 3.1.18)

type of redundancy.

3.1.38 sense data: Data describing an error or exceptional condition that a device server delivers to an

application client in association with CHECK CONDITION status. See SPC-3.

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