BS ISO IEC 20919-2016 Information technology Linear Tape File System (LTFS) Format Specification《信息技术 线性磁带文件系统 (LTFS) 格式规格》.pdf

1、BSI Standards Publication BS ISO/IEC 20919:2016 Information technology Linear Tape File System (LTFS) Format SpecificationBS ISO/IEC 20919:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO/IEC 20919:2016. The UK participation in its preparation was entrust

2、ed to Technical Committee ICT/-/1, Information systems co-ordination. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appl

3、ication. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 91317 4 ICS 35.220.20 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy

4、 Committee on 30 April 2016. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO/IEC 20919:2016 Information technology Linear Tape File System (L TFS) Format Specification Technologies de linformation Spcification du format de systme de fichier bande magntique IN T E R

5、NA T I O NA L S TA N DA R D ISO/IEC 20919 R ef erence number ISO/IEC 20919:2016(E) First edition 2016-04-01 ISO/IEC 2016 BS ISO/IEC 20919:2016ii ISO/IEC 2016 All rights r eserv ed COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2016, Published in S witzer land All rights r eserved. Unless otherwise specified,

6、no part of this publication may be r eproduced or utilized otherwise in any form or by any means, electronic or mechanical, including phot ocopying, or posting on the internet or an intr anet, without prior written permission. Permission can be r equested from either ISO at the address below or ISOs

7、 member body in the country of the r equest er . ISO cop yright office Ch. de Blandonnet 8 CP 401 CH-1214 V ernier, Gene va, S witzer land Tel. +41 22 749 01 11 Fax +41 22 749 09 47 cop yrig htiso.or g www .iso.or g ISO/IEC 20919:2016(E) ISO/IEC 2016 All rights r eserv ed iii Foreword ISO (the In t

8、e r n a t i o nal Or g a n i z a t i on for Standardization) and IEC (the In t e r n a t i o nal El e c t r o t e c h n i c a l Co m m is s io n ) f or m t he s pe c ia l iz e d system for worldwide standardization. National bodies that are mem bers of ISO or IEC participate in the de v e l o pment

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15、ng URL: www.iso.org/iso/foreword.html . ISO/IEC 209 19 : 20 16 was prepared by SNIA and adopted, under the PAS procedure, by joint technical committee ISO/IEC JTC 1, Information technology , i n p ar al l el w it h i ts a ppr o v a l b y n at i on a l bodies of ISO and IEC. BS ISO/IEC 20919:2016 ISO

16、/IEC 20919:2016(E)BS ISO/IEC 20919:2016ISO/IEC 20919:2016(E)BS ISO/IEC 20919:2016 Linear Tape File System (LTFS) Format Specification Version 2.2.0 This document has been released and approved by the SNIA. The SNIA believes that the ideas, methodologies and technologies described in this document ac

17、curately represent the SNIA goals and are appropriate for widespread distribution. Suggestions for revision should be directed to http:/www.snia.org/feedback/ SNIA Technical Position December 21, 2013 BS ISO/IEC 20919:2016 ISO/IEC 20919:2016(E)BS ISO/IEC 20919:2016 Revision History Revision Date Sec

18、tions Originator: Comments 2.1.0 May 18, 2012 Entire Document David Pease LaTeX version contributed by IBM 2.2.0 rev a January 15, 2013 Entire document Arnold Jones Converted to Microsoft Word 2.2.0 rev b March 15, 2013 Entire document Carl Madison Edits/Additions per TWG 2.2.0 rev c April 4, 2013 E

19、ntire document Carl Madison Edits/Additions per TWG F2F 2.2.0 rev d May 7, 2013 Entire document Carl Madison Diagram Replacement/edits 2.2.0 rev e May 28, 2013 Entire document Carl Madison F2F edits, misc edits 2.2.0 rev f July 16, 2013 Entire document Carl Madison Edits per TWG 2.2.0 rev g July 23,

20、 2013 Entire document Carl Madison Edits per TWG F2F 2.2.0 rev h July 29, 2013 Entire document Carl Madison Edits per TWG 2.2.0 rev i July 30, 2013 Entire document Carl Madison Edits per TWG 7/30/13 mtg 2.2.0 rev j August 13, 2013 Entire document Carl Madison Edits per TWG 8/13/13 mtg 2.2.0 rev k Au

21、gust 27, 2013 Entire Document Carl Madison Edits per TWG 8/27/13 mtg. 2.2.0 SNIA Technical Position December 21, 2013* March 14, 2013* Entire Document Carl Madison *2.2.0 rev k formatted as a SNIA Technical Position after SNIA membership approval. *Additional editorial revisions Suggestion for chang

22、es or modifications to this document should be sent to the SNIA Linear Tape File System Technical Work Group at http:/www.snia.org/feedback/. Changes between v1.0 and v2.0.0 Incremented version number to 2.0.0 and updated date to March 11, 2011. Improvements in specification text to remove ambiguity

23、 and clarify intention of the specification. These changes were made at several locations throughout the document. Improvements to clarify description of MAM parameters in Section 9 Medium Auxiliary Memory. Removed reference to a specific version of the Unicode standard in Section 6.5 Name pattern f

24、ormat. This removes any requirement to use specific versions of Unicode support code in an implementation. Improved description of Name pattern format to remove ambiguity in Section 6.5 Name pattern format. Added description of LTFS Format specification version numbering in Section 2.1 Versions. Upd

25、ated XML Schema for Label and Index to match version number format in Annex A and Annex B. Added specification of minimum and recommended blocksize value for LTFS Volumes to Section 7.1.2 LTFS Label. Added definition of allowed version numbers to Section 7.1.2 LTFS Label and Section 8.2 Index. Added

26、 definition of fileoffset tag in Section 8.2 Index. Extended description in Section 5 Data Extents to support addition of fileoffset tag and associated functionality. Added definition of highestfileuid tag in Section 8.2 Index. Added definition of fileuid tag in Section 8.2 Index. BS ISO/IEC 20919:2

27、016 ISO/IEC 20919:2016(E)BS ISO/IEC 20919:2016 Added definition of backuptime tag in Section 8.2 Index. Incremented version number in Application Client Specific Information (ACSI) structure shown in 9.3 Use of Volume Coherency Information for LTFS. This increment allows identification of LTFS Volum

28、es written with a LTFS v1.0 compliant implementation. A widely used v1.0 implementation wrote ambiguous ACSI values due to an implementation bug. Added definition of extended attributes in the ltfs.* namespace in Annex C. Added description for handling unknown XML tags in Index to Section 8.2.10 Man

29、aging LTFS Indexes. Changes between v2.0.0 and v2.0.1 Incremented specification version number to 2.0.1. Updated specification date to August 17, 2011. Expanded historical record of changes between revisions of LTFS Format Specification. Improved description of constraints for two Indexes having the

30、 same generation number in Section 4.4.1 Generation Number to make it clear that differences in access time values is permitted between Indexes that are otherwise except for self pointer and index pointer values. Added note in Section 4.4.1 Generation Number to explicitly state that Index generation

31、 numbers may increase by integer values other than 1. Expanded description of the ltfs.sync extended attribute in Annex C . The expanded description explicitly states that this extended attribute triggers a sync of the in-memory data to the storage media. That is, the operation is analogous to a POS

32、IX sync operation. Changes between v2.0.1 and v2.1.0 Incremented specification version number to 2.1.0. Updated specification date to October 18, 2012. Added definition of symlink tag in Section 8.2 Index. Added example of symlink tag use in Annex E (informative) Complete Example LTFS Index. Added s

33、ymlink tag to Annex B. Added description of “ltfs.vendor.X.Y” extended attribute namespace in Annex C . Added description of software metadata section in Annex C. Added description of drive metadata section in Annex C. Added ”ltfs.labelVersion” extended attribute in Annex C. Added ”ltfs.indexVersion

34、” extended attribute in Annex C Added ”ltfs.mediaEncrypted” extended attribute in Annex C . Improved description of ”ltfs.mediaStorageAlert” extended attribute in Annex C. Changes between v2.1.0 and v2.2.0 Incremented specification version number to 2.2.0. Updated specification date to July 16, 2013

35、. Changed “2010” to “2013” in XML examples. Editorial Cleanup. BS ISO/IEC 20919:2016 ISO/IEC 20919:2016(E)BS ISO/IEC 20919:2016 Changed “extentinfo” definition in Section 8.2 Index. Changed “symlink” definition in Section 8.2 Index. Added additional paragraph to “symlink” definition in Section 8.2 I

36、ndex. Added general comments at start of Section 9 Medium Auxiliary Memory. Added Section 9.4 Use of Host-type Attributes for LTFS. Removed Section 9 Certification from document. Added “ltfs.mamBarcode” extended attribute in Annex C.4 Volume Metadata. Added “ltfs.mamApplicationVendor” extended attri

37、bute in Annex C.4 Volume Metadata. Added “ltfs.mamApplicationVersion” extended attribute in Annex C.4 Volume Metadata. Added “ltfs.mamApplicationFormatVersion” extended attribute in Annex C.4 Volume Metadata. Added new Annex F Interoperability Recommendation and added File Spanning and File Permissi

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42、s to make updates and other information available through their web site at http:/www.snia.org. SNIA Address Requests for interpretation, suggestions for improvement and addenda, or defect reports are welcome. They should be sent via the SNIA Feedback Portal at http:/www.snia.org/feedback/ or by mai

43、l to the Storage Networking Industry Association, 4360 ArrowsWest Drive, Colorado Springs, Colorado 80907, U.S.A. BS ISO/IEC 20919:2016 ISO/IEC 20919:2016(E)BS ISO/IEC 20919:2016 Disclaimer The information contained in this publication is subject to change without notice. The SNIA makes no warranty

44、of any kind with regard to this specification, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. The SNIA shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, perform

45、ance, or use of this specification. Suggestions for revisions should be directed to http:/www.snia.org/feedback/. Copyright 2013-2014 Storage Networking Industry Association. Acknowledgements The SNIA LTFS Technical Working Group, which developed and reviewed this specification, would like to recogn

46、ize the significant contributions made by the following members: EMC Corporation Don Deel Hewlett-Packard . Chris Martin IBM . David Pease Ed Childers NetApp David Slik Oracle Corporation. Matthew Gaffney . . Carl Madison Quantum Corporation. Paul Stone SNIA . Arnold Jones BS ISO/IEC 20919:2016 ISO/

47、IEC 20919:2016(E)BS ISO/IEC 20919:2016 Contents 1 Introduction 10 2 Scope 11 2.1 Versions 11 2.2 Conformance . 12 3 Definitions and Acronyms 13 3.1 Definitions 13 3.2 Acronyms 15 4 Volume Layout . 16 4.1 LTFS Partitions 16 4.2 LTFS Constructs . 16 4.3 Partition Layout . 17 4.4 Index Layout 18 5 Data

48、 Extents . 20 5.1 Extent Lists 20 5.2 Extents Illustrated 20 5.3 Files Illustrated 22 6 Data Formats 26 6.1 Boolean format 26 6.2 Creator format . 26 6.3 Extended attribute value format 26 6.4 Name format 27 6.5 Name pattern format . 27 6.6 String format 27 6.7 Time stamp format 28 6.8 UUID format 2

49、8 7 Label Format 29 7.1 Label Construct . 29 BS ISO/IEC 20919:2016 ISO/IEC 20919:2016(E)BS ISO/IEC 20919:2016 8 Index Format 32 8.1 Index Construct . 32 8.2 Index 32 9 Medium Auxiliary Memory 43 9.1 Volume Change Reference . 43 9.2 Volume Coherency Information . 44 9.3 Use of Volume Coherency Information for LTFS 44 9.4 Use of Host-type Attributes for LTFS 46 Annex A (normative) LTFS Label XML Schema . 48 Annex B (no