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1、INCITS Technical Report Information Technology SCSI Domain Validation (SDV)INCITS TR-28-2002 Developed by the InterNational Committee for Information Technology Standards (INCITS) Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facilit
2、y Yokosuka/9961031100 Not for Resale, 05/08/2007 23:28:26 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007
3、 23:28:26 MDTNo reproduction or networking permitted without license from IHS -,-,- INCITS TR-28-2002 INCITS Technical Report Secretariat Information Technology Industry Council Abstract This technical report describes the methods by which users may measure the performance characteristics of a paral
4、lel SCSI domain. This report does not provide definitions or specifications of components utilized in configuring the domain. Physical attributes of the domain are defined in the SCSI family of standards. These standards should be consulted before implementing the recommendations outlined in this te
5、chnical report. The information in this technical report does not supersede any requirements in the referenced standards. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:28:26
6、MDTNo reproduction or networking permitted without license from IHS -,-,- This Technical Report is one in a series produced by the InterNational Committee for Information Technology Standards (INCITS). The secretariat for INCITS is held by the Information Technology Industry Council (ITI), 1250 Eye
7、Street, NW, Suite 200, Washington, DC 20005. As a by-product of the standards development process and the resources of knowledge devoted to it, INCITS from time to time produces Technical Reports. Such Technical Reports are not standards, nor are they intended to be used as such. INCITS Technical Re
8、ports are produced in some cases to disseminate the technical and logical concepts reflected in standards already published or under development. In other cases, they derive from studies in areas where it is found premature to develop a standard due to a still changing technology, or inappropriate t
9、o develop a rigorous standard due to the existence of a number of viable options, the choice of which depends on the users particular requirements. These Technical Reports, thus, provide guidelines, the use of which can result in greater consistency and coherence of information processing systems. W
10、hen the draft Technical Report is completed, the Technical Committee approval process is the same as for a draft standard. Processing by INCITS is also similar to that for a draft standard. CAUTION: The developers of this technical report have requested that holders of patents that may be required f
11、or the implementation of the technical report, disclose such patents to the publisher. However, neither the developers nor the publisher have undertaken a patent search in order to identify which, if any, patents may apply to this technical report. As of the date of publication of this technical rep
12、ort, following calls for the identification of patents that may be required for the implementation of the technical report, notice of one or more claims has been received. By publication of this technical report, no position is taken with respect to the validity of this claim or of any rights in con
13、nection therewith. The known patent holder(s) has (have), however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the publisher. No further p
14、atent search is conducted by the developer or the publisher in respect to any technical report it processes. No representation is made or implied that licenses are not required to avoid infringement in the use of this technical report. INCITS Technical Report Series Published by American National St
15、andards Institute 25 West 43rd Street, New York, New York 10036 Copyright 2002 by Information Technology Industry Council (ITI) All rights reserved No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publi
16、sher. Printed in the United States of America PATENT STATEMENT Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:28:26 MDTNo reproduction or networking permitted without license
17、from IHS -,-,- i Table of Contents 1 Scope1 2 References .1 2.1 Approved references .1 2.2 References under development 1 3 Definitions, abbreviations, and keywords.2 3.1 Definitions2 3.2 Abbreviations.3 3.3 Keywords.4 4 Examples of parallel SCSI domain configurations .5 4.1 SCSI bus segment and dri
18、ver-receiver connections.5 4.2 Typical configurations6 5 Domain examination.9 5.1 General9 5.2 Topology discovery9 5.3 Assumptions9 5.4 Data patterns.9 5.5 Test descriptions9 5.5.1 Test order .9 5.5.2 Test conditions10 5.5.3 Basic test 10 5.5.4 Enhanced test.10 5.5.5 Test output11 5.6 Margin Test11
19、5.6.1 Assumption.11 5.6.2 Test order .11 5.6.3 Test conditions11 5.6.4 Margin test and parameters12 5.6.5 Test combinations.13 5.6.6 Test direction13 5.6.7 Test criteria.13 5.6.8 Test output13 5.6.9 Flow chart .13 Table of Figures Figure 1 Driver-receiver connection 5 Figure 2 Simplified domain A.6
20、Figure 3 Simplified domain B.6 Figure 4 Example domain with expander7 Figure 5 Example dual initiator domain.7 Figure 6 Example of complex domain.8 Figure 7 Domain examination14 Figure 7 continued Domain validation.15 Figure 7 continued Domain examination.16 Copyright American National Standards Ins
21、titute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:28:26 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright American National Standards Institute Provided by IHS under license with ANSI L
22、icensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:28:26 MDTNo reproduction or networking permitted without license from IHS -,-,- INCITS TR-28-2002 1 1 Scope This technical report provides guidance to users of parallel SCSI beyond that contained in the formal standar
23、ds. This technical report describes the methods of characterizing a parallel SCSI domain by varying analog driver parameters and monitoring the results. The architecture for varying receiver parameters may be consistent with that used when varying analog driver parameters. The architecture for varyi
24、ng receiver parameters is not addressed in this technical report. This technical report addresses measuring the performance of driver-receiver connections. SCSI Parallel Interface-4 specifies minimum requirements of those connections. 2 References The following standards contain provisions that, thr
25、ough reference in the text, constitute provisions of this technical report. At the time of publication, the revisions indicated were valid. All standards are subject to revision, and parties to agreements based on this technical report are encouraged to investigate the possibility of applying the mo
26、st recent revisions/editions of the standards listed below. Copies of the following standards may be obtained from ANSI: approved ANSI standards, approved and draft international and regional standards (ISO, IEC, CEN/CENELEC, ITUT), and approved and draft foreign standards (including BSI, JIS, and D
27、IN). 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. For further information or copies of NCITS Standards contact: NCITS Secretariat at 202-737-8888 (phone), 202-638-4922 (fax) or via E-mai
28、l at ncitsitic.org. To obtain copies of these standards contact: NCITS Online Store, managed by Techstreet, at 1327 Jones Drive, Ann Arbor, MI 48105 at 734-302-7801 (phone), 800-699-9277 (phone), or 734-302-7811 (fax); or Global Engineering at 15 Inverness Way East, Englewood, CO 80112-5704 at 303-7
29、92-2181 (phone), 800-854-7179 (phone), or 303-792-2192 (fax). 2.1 Approved references Currently, there are no approved normative references. 2.2 References under development At the time of publication, the following referenced standards were still under development. For information on the current st
30、atus of the standard, or regarding availability, contact the relevant standards body or other organization as indicated. T10/1365-D, SCSI Parallel Interface-4 T10/1157-D, SCSI Architecture Model-2 T10/1416-D, SCSI Primary Commands-3 NCITS TR-23:1998, SCSI Enhanced Parallel Interface Copyright Americ
31、an National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:28:26 MDTNo reproduction or networking permitted without license from IHS -,-,- INCITS TR-28-2002 2 3 Definitions, abbreviations, and keywords 3
32、.1 Definitions 3.1.1 application client: An object that is the source of SCSI commands. Further definition of an application client is found in the SCSI Architecture Model-2 standard. 3.1.2 asynchronous transfer: An information transfer that uses the asynchronous REQ/ACK handshake with a REQ/ACK off
33、set of zero. 3.1.3 byte: Indicates an 8-bit construct. 3.1.4 domain: The configuration of components within a service delivery subsystem that includes SCSI expanders, terminators, and cable plants that logically connect all attached SCSI initiators and SCSI targets. 3.1.5 double transition (DT): The
34、 latching of data on both the assertion edge and the negation edge of the REQ or ACK signals. 3.1.6 driver: The circuitry used to control the state of the SCSI bus segment. 3.1.7 driver-receiver connection: An assembly of driver, receiver, terminators, and the cable plant that produce the electrical
35、 coupling between the driver and receiver involved in the measurement. 3.1.8 expander: A device that connects SCSI bus segments together to form a single domain. 3.1.9 fast-5: Negotiated to receive synchronous data at a transfer period that translates into a transfer rate less than or equal to 5 meg
36、atransfers per second. 3.1.10 fast-10: Negotiated to receive synchronous data at a transfer period that translates into a transfer rate greater than 5 megatransfers per second and less than or equal to a transfer rate of 10 megatransfers per second. 3.1.11 fast-20: Negotiated to receive synchronous
37、data at a transfer period that translates into a transfer rate greater than 10 megatransfers per second and less than or equal to a transfer rate of 20 megatransfers per second. 3.1.12 fast-40: Negotiated to receive synchronous data at a transfer period that translates into a transfer rate greater t
38、han 20 megatransfers per second and less than or equal to a transfer rate of 40 megatransfers per second. 3.1.13 fast-80: Negotiated to receive synchronous data at a transfer period that translates into a transfer rate greater than 40 megatransfers per second and less than or equal to a transfer rat
39、e of 80 megatransfers per second. 3.1.14 fast-160: Negotiated to receive synchronous data at a transfer period that translates into a transfer rate of 160 megatransfers per second. 3.1.15 initiator: Synonymous with SCSI initiator port (see 3.1.26). 3.1.16 logical unit: An externally addressable enti
40、ty within a SCSI target device. See the SCSI Architecture Model-2 standard for a detailed definition of a logical unit. 3.1.17 logical unit number (LUN): An identifier for a logical unit. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair
41、 Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:28:26 MDTNo reproduction or networking permitted without license from IHS -,-,- INCITS TR-28-2002 3 3.1.18 margining: The process of measuring the response of driver-receiver connections to controllable changes in the driver properties. 3.1
42、.19 megatransfers per second: The repetitive rate that data are transferred across the bus. This is equivalent to 220 bytes per second on an 8-bit wide bus. 3.1.20 path: The cable, printed circuit board or other means for providing the conductors and insulators that connect two or more points. 3.1.2
43、1 receiver: The circuitry used to detect the state of the SCSI bus segment. 3.1.22 SCSI address: The decimal representation of the unique address assigned to a SCSI device. 3.1.23 SCSI bus segment: A SCSI bus segment consists of all the conductors and connectors required to attain signal line contin
44、uity between every driver, receiver, and two terminators for each signal. It is not necessary that a SCSI bus segment contain any specific combination of devices but a segment has at least two devices attached. Devices include: targets, initiators, and expanders in this context. The end- points of S
45、CSI bus segments are defined by the position of the terminators. 3.1.24 SCSI device: A device containing at least one SCSI port and the means to connect its drivers and receivers to the bus segment. 3.1.25 SCSI ID: The bit-significant representation of the SCSI address where ID0 is the least signifi
46、cant bit. 3.1.26 SCSI initiator port: A SCSI initiator device object acts as the connection between application clients and the service delivery subsystem through which requests and responses are routed. See the SCSI Architecture Model-2 standard for a detailed definition of a SCSI initiator port. 3
47、.1.27 SCSI target port: A SCSI target device object that contains a task router and acts as the connection between device servers and task managers and the service delivery subsystem through which requests and responses are routed. See the SCSI Architecture Model-2 standard for a detailed definition
48、 of a SCSI target port. 3.1.28 SCSI Terminator: The terminator is at each end of a SCSI bus segment. The terminator provides impedance match and biasing, holding the bus in a negated state when it is not driven. 3.1.29 service delivery subsystem: That part of a SCSI I/O system that transmits service requests to a logical unit or target and returns logical unit or target responses to an initiator. 3.1.30 single transition (ST): The latching of data only on the assertion edge of the REQ or ACK signals. 3.1.31 synchronous tran