未完成的T10技术委员会草案：SCSI主命令-4（SPC-4）

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"SCSI Primary Commands - 4 (SPC-4)是信息技术领域的一个工作草案，由T10技术委员会隶属于国际信息科技标准委员会INCITS制定。SPC-4是SCSI（小型计算机系统接口）的主要命令集的第四版，但请注意，这并非一个已完成并批准的标准，内容可能在T10技术委员会的讨论和修订中发生变化。此文档仅供审查和评论，INCITS、其技术委员会和相关任务组的成员可复制用于标准制定活动，但禁止商业或营利性用途的复制。技术编辑是Ralph O. Weber，来自ENDL Texas。" SCSI（小型计算机系统接口）是一种广泛应用于存储设备和磁盘驱动器的接口标准，允许主机系统与多种类型的外围设备进行通信。SPC（SCSI Primary Commands）是定义SCSI协议的核心部分，包含了执行基本I/O操作所需的一系列命令。SPC-4是这个系列的最新版本，它可能包括了对以前版本的增强、改进和新的命令，以适应不断发展的存储技术需求。 SPC-4的工作草案可能涉及以下几个关键知识点： 1. 命令集扩展：随着存储技术的进步，SPC-4可能引入了新的SCSI命令，以支持高级功能，如更高效的数据传输、错误恢复机制、更好的设备管理和安全特性。 2. 容错和可靠性：作为一个重要的更新版本，SPC-4可能包含了改进的错误处理和恢复策略，以提高系统整体的稳定性和数据完整性。 3. 性能优化：可能包含针对并发操作的优化，以及针对高带宽和低延迟需求的改进，以满足大数据和云计算环境的需求。 4. 安全性：随着数据保护变得越来越重要，SPC-4可能引入了新的安全特性，如加密、访问控制和认证机制，以保护存储在SCSI设备上的数据。 5. 设备管理：为了简化管理和维护，SPC-4可能会增强设备的自我报告能力，提供更详细的诊断信息，并支持远程管理功能。 6. 兼容性：尽管SPC-4是一个未完成的标准，但它需要确保与现有的SCSI设备和软件兼容，同时也要为未来的标准化铺平道路。 7. SAS（串行连接SCSI）支持：由于SAS是SCSI的一个重要分支，SPC-4可能特别关注SAS设备的特性和要求，以促进SAS技术的发展。 8. 国际标准化：作为INCITS的工作文档，SPC-4最终可能将通过ISO（国际标准化组织）进行国际化标准制定，确保全球范围内的互操作性和一致性。 SPC-4的细节内容，如具体的命令定义、参数和操作流程，将在T10技术委员会的后续修订过程中逐渐明朗。由于这是一个未批准的标准，所有这些信息都可能发生变化，因此关注T10的技术动态和更新对于理解SPC-4的最终形态至关重要。

T10/1731-D Revision 25 23 June 2010

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

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'.

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.

23 June 2010 T10/1731-D Revision 25

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

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

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.

T10/1731-D Revision 25 23 June 2010

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

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

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).

23 June 2010 T10/1731-D Revision 25

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

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.

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;

T10/1731-D Revision 25 23 June 2010

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

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).

The table headings in the normative additional sense codes table and in all tables in numeric codes annex were

updated to reference more current versions of SES, ADC, and OSD.

Several editorial corrections (e.g., “a a non-SCSI”) were made but not marked with change bars.

2.27 Revision 22 (28 September 2009)

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

09-281r0 Request ASC/ASCQ for insufficient power condition [ASC only]

09-342r0 Preempt And Abort has a cross-nexus effect

To emphasize the fact that the list which follows is incomplete, the text that introduces the list of preparatory actions

for an EXTENDED COPY command was changed from “Such preparatory actions include:” to “Such preparatory

actions include but are not limited to:”.

The Numeric Codes annex list of log page codes reserved to the MS59 Std. (contact AIIM C21 comm.) was

corrected to not include the all subpages log page subcode.

The note after the supported subpage descriptor table in the supported subpages log page was corrected to match

the table it describes.

Several editorial corrections (e.g., “each of specific command” was changed to “of each specific”) were made but

not marked with change bars.

2.28 Revision 23 (9 February 2010)

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

09-100r5 SBC-3 - Atomic COMPARE AND WRITE command [operation code only]

09-146r4 Tape end-to-end logical block protection Inquiry … Data

09-241r6 SCSI Referrals [Penokie]

09-250r4 Change power condition timer behavior when commands are received

09-294r2 Adding a new VPD bit indicating download microcode behavior

09-303r1 SSC-4 Device and volume log page enhancements [log page code only]

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