1、Information technology Linear tape file system(LTFS)Format specificationTechnologies de linformation Spcification du format de systme de fichier bande magntique ISO/IEC 2021INTERNATIONAL STANDARDISO/IEC20919Reference numberISO/IEC 20919:2021(E)Second edition2021-07 ISO/IEC 20919:2021(E)ii ISO/IEC 20
2、21 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO/IEC 2021All rights reserved.Unless otherwise specified,or required in the context of its implementation,no part of this publication may be reproduced or utilized otherwise in any form or by any means,electronic or mechanical,including photocopyi
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4、so.orgWebsite:www.iso.orgPublished in SwitzerlandISO/IEC 20919:2021(E)ISO/IEC 2021 All rights reserved iii Foreword ISO(the International Organization for Standardization)and IEC(the International Electrotechnical Commission)form the specialized system for worldwide standardization.National bodies t
5、hat are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity.ISO and IEC technical committees collaborate in fields of mutual interest.Other interna
6、tional organizations,governmental and non-governmental,in liaison with ISO and IEC,also take part in the work.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives,Part 1.In particular,the different approval criteria neede
7、d for the different types of document should be noted(see www.iso.org/directives or www.iec.ch/members_experts/refdocs).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.ISO and IEC shall not be held responsible for identifying any o
8、r all such patent rights.Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received(see www.iso.org/patents)or the IEC list of patent declarations received(see patents.iec.ch).Any trade name used i
9、n this document is information given for the convenience of users and does not constitute an endorsement.For an explanation of the voluntary nature of standards,the meaning of ISO specific terms and expressions related to conformity assessment,as well as information about ISOs adherence to the World
10、 Trade Organization(WTO)principles in the Technical Barriers to Trade(TBT),see www.iso.org/iso/foreword.html.In the IEC,see www.iec.ch/understanding-standards.This document was prepared by the Storage Networking Industry Association(SNIA)(as Linear Tape File System(LTFS)Format Specification,Version
11、2.5)and drafted in accordance with its editorial rules.It was adopted,under the JTC 1 PAS procedure,by Joint Technical Committee ISO/IEC JTC 1,Information technology.This second edition cancels and replaces the first edition(ISO/IEC 20919:2016),which has been technically revised.The main changes com
12、pared to the previous edition are as follows:Volume Advisory Locking a method of marking a volume as locked against future modification;Percent Encoding method of including previously reserved characters in names of files and directories;Incremental Indexes a method of recording a smaller index cont
13、aining only changes since the last index;File hashes a method of recording fils hash information in the index in an interchangeable manner;Open For Write a method of noting files in the index which were still open at the time the index is written to tape.Any feedback or questions on this document sh
14、ould be directed to the users national standards body.A complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-committees.ISO/IEC 20919:2021(E)2 SNIA Standard LTFS Format Specification Version 2.5.1 ISO 2021 All rights reserved USAGE Copyright 2020 SNIA.All
15、 rights reserved.All other trademarks or registered trademarks are the property of their respective owners.The SNIA hereby grants permission for individuals to use this document for personal use only,and for corporations and other business entities to use this document for internal use only(includin
16、g internal copying,distribution,and display)provided that:1.Any text,diagram,chart,table or definition reproduced shall be reproduced in its entirety with no alteration,and,2.Any document,printed or electronic,in which material from this document(or any portion hereof)is reproduced,shall acknowledge the SNIA copyright on that material,and shall credit the SNIA for granting permission for its reuse.Other than as explicitly provided above,you may not make any commercial use of this document or any