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BS ISO/IEC 20919:2021

BS ISO/IEC 20919:2021

$215.11

Information technology. Linear tape file system (LTFS) Format specification

Published By Publication Date Number of Pages
BSI 2021 104
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This document defines the LTFS Format requirements for interchanged media that claims LTFS compliance. Those requirements are specified as the size and sequence of data blocks and file marks on the media, the content and form of special data constructs (the LTFS Label and LTFS Index), and the content of the partition labels and use of MAM parameters.

The data content (not the physical media) of the LTFS format shall be interchangeable among all data storage systems claiming conformance to this format. Physical media interchange is dependent on compatibility of physical media and the media access devices in use.

NOTE: This document does not contain instructions or tape command sequences to build the LTFS structure.

PDF Catalog

PDF Pages PDF Title
2 undefined
19 1 Introduction
20 2 Scope
2.1 Versions
21 2.2 Conformance
22 3 Normative references
23 4 Definitions and Acronyms
4.1 Definitions
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
4.1.9
4.1.10
24 4.1.11
4.1.12
4.1.13
4.1.14
4.1.15
4.1.16
4.1.17
4.1.18
4.1.19
4.1.20
4.1.21
25 4.1.22
4.1.23
4.1.24
4.1.25
4.1.26
4.2 Acronyms
26 5 Volume Layout
5.1 LTFS Partitions
5.2 LTFS Constructs
5.2.1 Label Construct
5.2.2 Data Extent
27 5.2.3 Index Construct
5.3 Partition Layout
28 5.4 Index Layout
5.4.1 Generation Number
5.4.2 Self Pointer
29 5.4.3 Back Pointer
31 6 Data Extents
6.1 Extent Lists
6.2 Extents Illustrated
6.2.1 Starting and ending Data Extent with full block
32 6.2.2 Starting Data Extent with full block and ending with fractional block
6.2.3 Starting and ending Data Extent in mid-block
33 6.3 Files Illustrated
6.3.1 Simple Files
6.3.2 Shared Blocks
34 6.3.3 Sparse Files
35 6.3.4 Shared Data
36 7 Data Formats
7.1 Boolean format
7.2 Creator format
7.3 Extended attribute value format
7.4 Name format
38 7.5 Name pattern format
7.6 String format
7.7 Time stamp format
39 7.8 UUID format
40 8 Label Format
8.1 Label Construct
8.1.1 VOL1 Label
8.1.2 LTFS Label
42 8.1.3 Managing LTFS Labels
43 9 Index Format
9.1 Index Construct
9.2 Index
44 9.2.1 Example Full Index omitting the body
9.2.2 Example Incremental Index omitting the body
45 9.2.3 Required elements for every index
46 9.2.4 Optional elements for every index
47 9.2.5 Example Full Index that omits the Preface section
48 9.2.6 Required directory elements for a Full Index
49 9.2.7 Optional directory elements for a Full Index
9.2.8 Required file elements for a Full Index
50 9.2.9 Optional file elements for a Full Index
51 9.2.10 extendedattributes elements
52 9.2.11 Required and Optional elements for Incremental Indexes
9.2.12 Example Incremental Index that omits the Preface section
53 9.2.13 Managing LTFS Indexes
54 9.2.14 Data Placement Policy
9.2.15 Data Placement Policy Alteration
55 9.2.16 Allow Policy Update is set
9.2.17 Allow Policy Update is unset
9.2.18 Data Placement Policy Application
56 9.2.19 Volume Advisory Locking
57 10 Medium Auxiliary Memory
10.1 Volume Change Reference
58 10.2 Volume Coherency Information
10.3 Use of Volume Coherency Information for LTFS
59 10.4 Use of Host-type Attributes for LTFS
60 10.4.1 Application Vendor
10.4.2 Application Name
10.4.3 Application Version
10.4.4 Text Localization Identifier
10.4.5 User Medium Text Label
61 10.4.6 Barcode
10.4.7 Media Pool
10.4.8 Application Format Version
10.4.9 Medium Globally Unique Identifier
10.4.10 Media Pool Globally Unique Identifier
10.4.11 Example attributes
10.5 Volume Advisory Locking
63 Annex A (normative) LTFS Label XML Schema
65 Annex B (normative) LTFS Index XML Schemas
B.1 LTFS Full Index XML Schema
67 B.2 LTFS Incremental Index XML Schema
70 Annex C (normative) Reserved Extended Attribute definitions
C.1 Software Metadata
C.2 Drive Metadata
C.3 Object Metadata
71 C.4 Volume Metadata
73 C.5 Media Metadata
76 Annex D (informative) Example of Valid Simple Complete LTFS Volume
77 Annex E (informative) Complete Example LTFS Full Index
82 Annex F (normative) Interoperability Recommendations
F.1 Spanning Files across Multiple Tape Volumes in LTFS
F.1.1 File Naming
F.1.2 File Location
F.1.3 Segment References
F.1.4 Extended Attributes
83 F.1.5 File Operations
84 F.1.6 Examples
F.1.6.1 Example 1
85 F.1.6.2 Example 2
86 F.1.6.3 Example 3
87 F.2 File Permissions in LTFS
F.2.1 Unix Permissions:
88 F.2.2 POSIX ACLs:
F.2.3 NFSv4 ACLs:
89 F.2.4 NTFS ACLs:
90 F.3 Storing File Hash Values in LTFS
F.3.1 Extended Attributes
F.3.2 Representation
91 F.4 LTFS Media Pools
F.4.1 Media Pool Membership of a Volume
F.4.1.1 Media Pool MAM Attributes
93 Annex G (informative) Character representations
96 Annex H (informative) Incremental Indexes
H.1 Background
H.2 Backwards Compatibility
97 H.3 Traversing the Index Back Pointer Chain
H.4 Incremental Index Format
99 H.5 Processing Incremental Indexes
100 H.6 Miscellaneous
102 Annex I (informative) Bibliography

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BS ISO/IEC 20919:2021
$215.11