SCSI 主要命令 - 4（SPC-4）：T10 技术委员会工作草案

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"SCSI Primary Commands - 4 (SPC-4) 是T10技术委员会内部的一个工作文档，属于INCITS（国际信息技术标准委员会）的一部分。这份文档尚未完成并获得批准，其内容可能会被T10技术委员会修改。当前版本为修订29，日期为2011年1月17日，主要涉及SCSI（小型计算机系统接口）的主命令集第四版的规范。此文档仅供审查和评论，未经授权禁止用于商业或营利目的。文档的技术编辑是Ralph O. Weber，来自ENDL Texas。" SCSI（Small Computer System Interface）是一种广泛应用于存储设备、磁盘驱动器、打印机等硬件的接口标准，它定义了设备如何与主机通信。SPC-4是这个标准的一部分，详细规定了主机系统和SCSI设备之间交互时使用的命令集。这些命令包括但不限于数据传输、错误处理、设备状态查询、配置管理等功能。 SPC-4的重要性在于它不断更新以适应现代存储技术的发展，如更高的数据传输速率、更复杂的存储层次结构（如固态硬盘和磁盘阵列）、以及更高级别的服务质量（QoS）要求。SCSI标准的升级旨在提高性能、可靠性和兼容性，同时引入新的特性，比如节能模式、安全加密、远程管理功能等。在SCSI命令集中，一些关键的命令包括： 1. **INQUIRY**：用于获取设备的基本信息，如设备类型、制造商、产品ID等。 2. **READ/WRITE**(10/16)：执行读写操作，从设备读取或写入数据。 3. **TEST UNIT READY**：检查设备是否准备就绪，可以进行I/O操作。 4. **FORMAT UNIT**：对设备进行格式化，设置磁道和扇区布局。 5. **START/STOP UNIT**：控制设备的启动、停止或暂停操作。 6. **REPORT LUNS**：获取设备支持的逻辑单元号（LUNs）列表。 7. **SERVICE ACTION**：提供扩展功能，如SMART（自我监测、分析和报告技术）数据的获取。 SPC-4还涵盖了错误恢复策略、命令序列管理和多路径I/O（MPIO），确保在出现错误或路径故障时的数据完整性。此外，该标准可能还涉及SCSI协议的新特性，例如SCSI Over TCP/IP（SAT）或光纤通道（FC）等网络协议的支持，以实现更灵活的存储区域网络（SAN）架构。随着技术的不断发展，SPC-4的后续修订将继续优化和扩展SCSI命令集，以满足未来存储需求。对于IT专业人士而言，理解并熟悉SPC-4有助于设计、实施和维护高效、可靠的存储解决方案。

T10/1731-D Revision 29 17 January 2011

xvi Working Draft SCSI Primary Commands - 4 (SPC-4)

In the fixed format sense data definition, the descriptions for the

ILI bit, FILEMARK bit, and EOM bit were modified to

align them with the description of the

INFORMATION field. The concepts found in the r12 descriptions of these bits

were turned into 'e.g.' examples.

Two confusing instances of 'single algorithm' were changed to 'combined integrity check and encryption algorithm'

in the IKEv2-SCSI Authentication step model subclause. Wording problems related to combined modes were fixed

in protocol details informative annex.

The reference for the ATA Device Server Password Security security protocol was changed to SAT-2.

Since SAT-2 does not support tape devices, the T was removed from the codes annex rows for the

Parallel ATA

Control and Serial ATA Control mode pages.

A UML reference was added to clause 2. UML notation conventions based on the SAM-4 conventions were added

to clause 3.

The reference on the restricted bytes in the REPORT DEVICE IDENTIFYING INFORMATION command table was

corrected to read SCC-2.

A normative reference to SSC-2 was added because of the reference to the RS

MK bit, which is obsolete in SSC-3.

Other editorial corrections to minor to identify were also made.

2.18 Revision 14 (17 March 2008)

The following T10 approved proposals were incorporated in this SPC-4 revision:

08-008r2 Download microcode I_T nexus usage

08-108r1 Completing the SET IDENTIFYING INFORMATION command

08-113r2 UML Conventions and CbCS UML Updates

08-138r1 Constraints on SPC-4 SA creation based on Usage Type

08-158r1 ESP-SCSI field alignments

Problems with SMC-2 related additional sense code definitions were corrected.

In the IKEv2-SCSI SA Cryptographic Algorithms payload format, the required value in the

NUMBER OF ALGORITHM

DESCRIPTORS

field was corrected from five to six so that it matches the number of entries in the ordered list of

algorithm descriptors.

08-008r2 failed to cover the case of non-zero buffer offsets received on the established I_T nexus. The obvious

intent was that such commands be processed as described elsewhere in the subclause. This was added as an

editorial change.

Based on input from the SAM-4 letter ballot review, all instance of specified status return values were evaluated for

the usage of 'terminated' or 'completed' in the description of the command. With the exception of CHECK

CONDITION status, commands were described as being 'completed'. For CHECK CONDITION status, the

command was described as being 'terminated'. Where such wording could not be applied the terms 'return' and

'response' were used. A few instance of 'task' were replaced with 'command'.

'Principals of SAs' was changed to 'Principles of SAs'.

17 January 2011 T10/1731-D Revision 29

Working Draft SCSI Primary Commands - 4 (SPC-4) xvii

2.19 Revision 15 (20 June 2008)

The following T10 approved proposals were incorporated in this SPC-4 revision:

08-145r3 Capability-based Command Security (CbCS) [the rewrite]

08-156r2 Non-volatile cache becoming volatile

08-177r0 Bogus Sense Key in SA Creation Parameter Data Error Handling

08-178r0 IKEv2-SCSI Message ID field size correction

08-180r0 SCSI device name cleanup in SPC-4

08-194r1 Common definition for CODE SET

08-199r1 Even more log page cleanup

08-214r1 Allowing ESP-SCSI descriptors in variable length CDBs

08-231r1 SPEC_I_PT clarification

The instruction in 08-053r1(Persistent reservation fixes) were not fully implemented in the 'Register behaviors for a

removed in this revision.

During the incorporation of 08-214r1, several instances where SA protection was restricted to command parameter

data were broadened to cover selected CDBs too.

To match SAM-4 Letter Ballot changes:

a) QUERY UNIT ATTENTION was changed to QUERY ASYNCHRONOUS EVENT in the REPORT

SUPPORTED TASK MANAGEMENT FUNCTIONS command definition; and

b) 'initial priority' was changed to 'initial command priority' in the REPORT PRIORITY command definition,

SET PRIORITY command definition, and the Control Extension mode page.

References to the under development ADC-3 were added wherever appropriate to support the Data Encryption

Configuration security protocol.

The

POWER CONDITION field name was modified to match the spelling in SBC-3 throughout.

Bogus IKEv2-SCSI Timeout Values an Identification – Device Server next payload code values as well as incorrect

references to the IKEv2-SCSI Timeout Values payload were corrected in the per/step next payloads table.

Several mode page entries in the numeric codes annex were updated to match the latest ADC-3 revision.

Several grammar errors were corrected and not marked with change bars.

In hopes of getting a jump on ISO SPC-4, all uses of dashes in range expressions (e.g., 5Ah-FFh) were changed to

use the word 'to' (e.g., 5Ah to FFh). These changes were not marked with change bars.

2.20 Revision 16 (29 July 2008)

The following T10 approved proposals were incorporated in this SPC-4 revision:

08-116r3 Protection Type 3 Reference Tag Clarification

08-254r0 Protocol Specific diagnostic page

08-261r1 Parsing variable-length parameter lists and data

08-262r0 SAI, SQN, IV, & Data must be contiguous

08-287r1 ATA Information VPD page nits

T10/1731-D Revision 29 17 January 2011

xviii Working Draft SCSI Primary Commands - 4 (SPC-4)

In the table defining the

ID TYPE field for the Identification – Application Client payload and Identification – Device

Server payload, the codepoint values for ID_FC_NAME and ID_KEY_ID were swapped so that the match the

values in RFC 4306.

The conventions subclause was updated to include the latest descriptions of the conventions for number value

ranges and lettered/numbered lists. Were the new number convention allowed, 'through' was replaced with 'to'.

Several incorrect subclause references discovered during the ISO SPC-3 review and an incorrect table reference

were corrected but not marked with change bars.

2.21 Revision 17 (13 November 2008)

The following T10 approved proposals were incorporated in this SPC-4 revision:

08-263r3 Too much to do … Not enough Progress Counters

08-327r2 Restrict SPC-4 and SAM-5 codes to FC-SB-4 use

08-346r2 Correction to IKEv2-SCSI Certificate Request Payload

08-450r1 Add Restricted keyword to the Style Guide

The last paragraph in the IKEv2-SCSI subclause titled 'Errors with high denial of service attack potential' was

modified to clarify when the requirements on the

SENSE KEY SPECIFIC field apply.

In the informative code values annex, the Parallel ATA Control mode page was constrained to SBC disk devices

and the Serial ATA Control mode page was removed.

One instance of NOT READY that 08-177r0 missed was changed to ILLEGAL REQUEST.

The expected and ignored keyword definitions were removed in accordance with decisions reached at the

September and November CAP meetings, respectively.

A couple of instances of SET TARGET GROUPS command were corrected to SET TARGET PORT GROUPS

command.

In several security algorithms codes tables in the key derivation model subclauses, code values of the form 000x

xxxxh were changed to 800x xxxxh to conform to the decision to have IETF-based algorithms numbered 800x

xxxxh.

Several minor typos and bogus cross references were corrected and not marked with change bars.

2.22 Revision 18 (18 February 2009)

The following T10 approved proposals were incorporated in this SPC-4 revision:

08-281r5 UAS Clause 4 (Model) {new ASC only}

08-356r5 Thin Provisioning Commands

08-396r3 Reporting support for all DIF types

08-415r4 Adding a Protection Information Interval

08-423r4 IKEv2-SCSI Authentication

09-002r0 Making the

PPC bit in the LOG SENSE command obsolete

09-019r0 Reclaim some Obsolete bits for future use

09-031 Mark Service Action In/Out (16) service action value 0Fh Restricted for SAT-3

09-034r1 EMail comment received from Mike Berhan busTRACE

09-054r1 Adding more idle power options

17 January 2011 T10/1731-D Revision 29

Working Draft SCSI Primary Commands - 4 (SPC-4) xix

For consistency with the T10 Style Guide, the notation for byte encoded character strings was changed from

enclosing such strings in double quotes to enclosing them in single quotes. This change was made throughout the

working draft and noted with change bars.

Several minor typos were corrected and not marked with change bars.

2.23 Revision 19 (2 May 2009)

The following T10 approved proposals were incorporated in this SPC-4 revision:

08-386r5 Cache hits and power on statistics

09-018r2 Implicit transition (RTPG) timeout notification enhancements

09-072r0 Substantive corrections to 09-054r1 -- Adding more idle power options

09-118r0 Mode Page 18h, Change 'Reserved' field to 'Protocol specific' field

For consistency with the other LOGICAL UNIT NOT READY additional sense codes, the name for ASC/ASCQ

04h/14h was modified as follows: LOGICAL UNIT NOT READY, SPACE ALLOCATION IN PROCESS

PROGRESS.

Several typos were corrected in the paragraph describing parameter codes 0004h and 0006h in the Start-Stop

Cycle Counter log page.

Two minor typos were corrected and not marked with change bars.

2.24 Revision 20 (22 May 2009)

The following T10 approved proposals were incorporated in this SPC-4 revision:

09-033r4 Device constituent VPD page

09-087r2 Rectifying conflicts for DEVOFFL and UNITOFFL

To better reflect the information available on the referenced web site, the description for security protocol code EDh

was changed to 'SDcard TrustedFlash Security Systems Specification 1.1.3'. This topic was discussed by the CAP

working group (minutes in 09-175).

To match the request-response model parameter names in 4.2, the capitalization of all instances of data-in buffer

and data-out buffer were corrected to Data-In Buffer and Data-Out Buffer, respectively. These changes were not

marked with change bars.

2.25 Revision 20a (25 May 2009)

All lists were updated to use the current ISO/T10 capitalization rules. In a nutshell, the first word of a list entry is

capitalized only if that same word would be capitalized if it appeared in the middle of a normal sentence.

The base font was changed from Helvetica to Arial.

None of these changes were marked with change bars, except the change bars shown here. The change bars from

revision 20 were left unchanged.

T10/1731-D Revision 29 17 January 2011

xx Working Draft SCSI Primary Commands - 4 (SPC-4)

2.26 Revision 21 (25 August 2009)

The following T10 approved proposals were incorporated in this SPC-4 revision:

09-011r8 Thin Provisioning Threshold Notification

09-162r2 Revise LOG SELECT w/ PCR=1 wording

09-167r2 PL_OC2 I_T Nexus loss fixes [additional sense code]

09-178r2 Add IPv6 target descriptor to XCOPY

09-199r1 Add IP Copy Engine service type to page 85h

09-200r0 Update Access Controls for READ CAPACITY(16)

09-208r1 SPC-3 vs SPC-4 Descriptor format REQUEST SENSE

09-211r1 How many sense data descriptors are too many?

09-219r1 Fix errors in description of log pages 0Eh and 1Ah

09-233r1 AC/DC MSB/LSB

09-237r0 Add clarification to Supported Log Pages log pages

As part of incorporating 09-233r1, MSB/LSB markings were also added to the

PARAMETER VALUE field in the log

parameter definition table. Like the fields cited in 09-233r1, log parameter values can be defined as either single

valued or multi-valued.

As part of incorporating 09-237r1, the page structure format tables in all cited subclauses were modernized and the

descriptions of values to which fields were required to be set was changed to the 'set as show in table x' form.

The power conditions model overview was modified to reflect the fact that a low power condition (i.e., stopped) is

defined in SBC-3.

At the request of the SAT-2 editor, the ATA-PASSTHROUGH Results log page was added to the numeric codes

annex.

At the request of the SSC-3 editor:

a) the READ(16) and WRITE(16) commands were made optional for tapes in the numeric codes annex (this

change was made in the database and thus not identified with a change bar);

b) the tape usage of the Format Status log page was removed from the numeric codes annex;

c) the Current Service Information log page (2Dh/00h) was added to the numeric codes annex and marked

for tapes usage;

d) the Medium Configuration mode page (1Dh/00h) was added to the numeric codes annex and marked for

tapes usage;

e) the Automation Device Serial Number VPD page (B3h) was added to the numeric codes annex and

marked for tapes usage; and

f) the MAM glossary entry was updated to mirror the one present in SSC-3.

Per an agreement reached in the CAP working group, all page code definition tables were moved to the beginning

of the subclause that defines that page format and usage. The page names or descriptions were moved to the

left-most column and sorted in alphabetical order. A single row indicating all other codes are reserved was added

(or modified) to appear as the last row of the table body. References to the numeric codes annex were modified to

name the correct annex subclause.

The SCSI standards family subclause was copied from SAM-5 r02 into this working draft. The figure was altered

slightly to reflect its presence in a different standard. The SCSI standards family was removed from clause 1 and

placed in the new subclause, if it was not already present there (this movement was not marked with change bars).

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