ANSI-INCITS-405-2005.pdf
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1、American National Standard Developed by for Information Technology SCSI Block Commands - 2 (SBC-2) ANSI INCITS 405-2005 ANSI INCITS 405-2005 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale
2、, 04/29/2007 12:52:35 MDTNo reproduction or networking permitted without license from IHS -,-,- Dedication This standard is dedicated to the memory of Gene E. Milligan, who was the original editor. Mr. Milligan was a dedicated and energetic participant on several INCITS Technical Committees, includi
3、ng T10, T11, T12, and T13. He chaired both T12 and T13 and was the International Representative for T10, T11, and T12. Mr. Milligan graduated in 1959 from UCLA with a degree in Electrical Engineering and was employed by Seagate Technology for over 30 years. His interests included flying, water and s
4、now skiing, and tinkering with anything that needed repair. He was also an avid sports fan. Memorial gifts may be made to Habitat for Humanity. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Res
5、ale, 04/29/2007 12:52:35 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI INCITS 405-2005 American National Standard for Information Technology SCSI Block Commands - 2 (SBC-2) Secretariat Information Technology Industry Council Approved May 19, 2005 American National St
6、andards Institute, Inc. Abstract This standard specifies the functional requirements for the SCSI Block Commands - 2 (SBC-2) command set. SBC-2 permits SCSI block logical units such as rigid disks to attach to computers and provides the definition for their use. This standard maintains a high degree
7、 of compatibility with the SCSI Block Commands (SBC) command set, ANSI INCITS 306-1998, and while providing additional functions, is not intended to require changes to presently installed devices or existing software. Copyright American National Standards Institute Provided by IHS under license with
8、 ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/29/2007 12:52:35 MDTNo reproduction or networking permitted without license from IHS -,-,- Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other c
9、riteria for approval have been met by the standards developer. Consensus is established when, in the judgement of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, bu
10、t not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved
11、the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Mo
12、reover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standa
13、rd. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive cur
14、rent information on all standards by calling or writing the American National Standards Institute. American National Standard Published by American National Standards Institute, Inc. 25 West 43rd Street, New York, NY 10036 Copyright 2005 by Information Technology Industry Council (ITI) All rights re
15、served. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of America CAUTION: The developers of this standard have requested that h
16、olders of patents that may be required for the implementation of the standard 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 standard. As of the date of publicatio
17、n of this standard and following calls for the identification of patents that may be required for the implementation of the standard, no such claims have been made. No further patent search is conducted by the de- veloper or publisher in respect to any standard it processes. No representation is mad
18、e or implied that licenses are not required to avoid infringement in the use of this standard. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/29/2007 12:52:35 MDTNo reproduction or ne
19、tworking permitted without license from IHS -,-,- i Contents Page Foreword .ix Introduction xi 1Scope. 1 2Normative References. 3 2.1Normative references overview . 3 2.2Approved references 3 2.3References under development. 4 3Definitions, symbols, abbreviations, keywords, and conventions 5 3.1Defi
20、nitions 5 3.2Symbols and abbreviations 7 3.3Keywords. 8 3.4Conventions. 8 4Direct-access block device type model 10 4.1Direct-access block device type model overview. 10 4.2Media examples. 10 4.2.1Media examples overview 10 4.2.2Rotating media. 10 4.2.3Memory media. 11 4.3Removable medium. 11 4.3.1R
21、emovable medium overview 11 4.3.2Removable medium with an attached media changer. 11 4.4Logical blocks 12 4.5Ready state 12 4.6Initialization 13 4.7Write protection 13 4.8Medium defects 14 4.9Write failures 14 4.10Caches. 15 4.11Implicit HEAD OF QUEUE command processing 16 4.12Reservations 16 4.13Er
22、ror reporting 18 4.13.1Error reporting overview. 18 4.13.2Block commands sense data descriptor 19 4.14Model for XOR commands. 19 4.14.1Model for XOR commands overview . 19 4.14.2Storage array controller supervised XOR operations 20 4.14.2.1Storage array controller supervised XOR operations overview.
23、 20 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/29/2007 12:52:35 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Page 4.14.2.2Update write operation. 2
24、0 4.14.2.3Regenerate operation 20 4.14.2.4Rebuild operation. 21 4.14.3Array subsystem considerations 21 4.14.3.1Array subsystem considerations overview. 21 4.14.3.2Buffer full status handling 21 4.14.3.3Access to an inconsistent stripe 21 4.14.4XOR data retention requirements 22 4.15START STOP UNIT
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