ISO/IEC 20919:2016
Information technology — Linear Tape File System (LTFS) Format Specification
ISO/IEC 20919:2016 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.
ISO/IEC 20919:2016 does not contain instructions or tape command sequences to build the LTFS structure.
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1 Introduction
2 Scope
2.1 Versions
2.2 Conformance
3 Definitions and Acronyms
3.1 Definitions
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.8
3.1.9
3.1.10
3.1.11
3.1.12
3.1.13
3.1.14
3.1.15
3.1.16
3.1.17
3.1.18
3.1.19
3.1.20
3.1.21
3.1.22
3.1.23
3.2 Acronyms
4 Volume Layout
4.1 LTFS Partitions
4.2 LTFS Constructs
4.2.1 Label Construct
4.2.2 Data Extent
4.2.3 Index Construct
4.3 Partition Layout
4.4 Index Layout
4.4.1 Generation Number
4.4.2 Self Pointer
4.4.3 Back Pointer
5 Data Extents
5.1 Extent Lists
5.2 Extents Illustrated
5.2.1 Starting and ending Data Extent with full block
5.2.2 Starting Data Extent with full block and ending with fractional block
5.2.3 Starting and ending Data Extent in mid-block
5.3 Files Illustrated
5.3.1 Simple Files
5.3.2 Shared Blocks
5.3.3 Sparse Files
5.3.4 Shared Data
6 Data Formats
6.1 Boolean format
6.2 Creator format
6.3 Extended attribute value format
6.4 Name format
6.5 Name pattern format
6.6 String format
6.7 Time stamp format
6.8 UUID format
7 Label Format
7.1 Label Construct
7.1.1 VOL1 Label
7.1.2 LTFS Label
7.1.3 Managing LTFS Labels
8 Index Format
8.1 Index Construct
8.2 Index
8.2.1 Example index omitting the body
8.2.2 Required elements for every index
8.2.3 Optional elements for every index
8.2.4 Example Index that omits the Preface section
8.2.5 Required directory elements
8.2.6 Optional directory elements
8.2.7 Required file elements
8.2.8 Optional file elements
8.2.9 extendedattributes elements
8.2.10 Managing LTFS Indexes
8.2.11 Data Placement Policy
8.2.12 Data Placement Policy Alteration
8.2.13 Allow Policy Update is set
8.2.14 Allow Policy Update is unset
8.2.15 Data Placement Policy Application
9 Medium Auxiliary Memory
9.1 Volume Change Reference
9.2 Volume Coherency Information
9.3 Use of Volume Coherency Information for LTFS
9.4 Use of Host-type Attributes for LTFS
9.4.1 Application Vendor
9.4.2 Application Name
9.4.3 Application Version
9.4.4 Text Localization Identifier
9.4.5 User Medium Text Label
9.4.6 Barcode
9.4.7 Application Format Version
9.4.8 Example attributes
Annex A (normative) LTFS Label XML Schema
Annex B (normative) LTFS Index XML Schema
Annex C (normative) Reserved Extended Attribute definitions
C.1 Software Metadata
C.2 Drive Metadata
C.3 Object Metadata
C.4 Volume Metadata
C.5 Media Metadata
Annex D (informative) Example of Valid Simple Complete LTFS Volume
Annex E (informative) Complete Example LTFS Index
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
F.1.5 File Operations
F.1.6 Examples
F.1.6.1 Example 1
F.1.6.2 Example 2
F.2 File Permissions in LTFS
F.2.1 Unix Permissions:
F.2.2 POSIX ACLs:
F.2.3 NFSv4 ACLs:
F.2.4 NTFS ACLs:
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1 Introduction
2 Scope
2.1 Versions
2.2 Conformance
3 Definitions and Acronyms
3.1 Definitions
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.8
3.1.9
3.1.10
3.1.11
3.1.12
3.1.13
3.1.14
3.1.15
3.1.16
3.1.17
3.1.18
3.1.19
3.1.20
3.1.21
3.1.22
3.1.23
3.2 Acronyms
4 Volume Layout
4.1 LTFS Partitions
4.2 LTFS Constructs
4.2.1 Label Construct
4.2.2 Data Extent
4.2.3 Index Construct
4.3 Partition Layout
4.4 Index Layout
4.4.1 Generation Number
4.4.2 Self Pointer
4.4.3 Back Pointer
5 Data Extents
5.1 Extent Lists
5.2 Extents Illustrated
5.2.1 Starting and ending Data Extent with full block
5.2.2 Starting Data Extent with full block and ending with fractional block
5.2.3 Starting and ending Data Extent in mid-block
5.3 Files Illustrated
5.3.1 Simple Files
5.3.2 Shared Blocks
5.3.3 Sparse Files
5.3.4 Shared Data
6 Data Formats
6.1 Boolean format
6.2 Creator format
6.3 Extended attribute value format
6.4 Name format
6.5 Name pattern format
6.6 String format
6.7 Time stamp format
6.8 UUID format
7 Label Format
7.1 Label Construct
7.1.1 VOL1 Label
7.1.2 LTFS Label
7.1.3 Managing LTFS Labels
8 Index Format
8.1 Index Construct
8.2 Index
8.2.1 Example index omitting the body
8.2.2 Required elements for every index
8.2.3 Optional elements for every index
8.2.4 Example Index that omits the Preface section
8.2.5 Required directory elements
8.2.6 Optional directory elements
8.2.7 Required file elements
8.2.8 Optional file elements
8.2.9 extendedattributes elements
8.2.10 Managing LTFS Indexes
8.2.11 Data Placement Policy
8.2.12 Data Placement Policy Alteration
8.2.13 Allow Policy Update is set
8.2.14 Allow Policy Update is unset
8.2.15 Data Placement Policy Application
9 Medium Auxiliary Memory
9.1 Volume Change Reference
9.2 Volume Coherency Information
9.3 Use of Volume Coherency Information for LTFS
9.4 Use of Host-type Attributes for LTFS
9.4.1 Application Vendor
9.4.2 Application Name
9.4.3 Application Version
9.4.4 Text Localization Identifier
9.4.5 User Medium Text Label
9.4.6 Barcode
9.4.7 Application Format Version
9.4.8 Example attributes
Annex A (normative) LTFS Label XML Schema
Annex B (normative) LTFS Index XML Schema
Annex C (normative) Reserved Extended Attribute definitions
C.1 Software Metadata
C.2 Drive Metadata
C.3 Object Metadata
C.4 Volume Metadata
C.5 Media Metadata
Annex D (informative) Example of Valid Simple Complete LTFS Volume
Annex E (informative) Complete Example LTFS Index
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
F.1.5 File Operations
F.1.6 Examples
F.1.6.1 Example 1
F.1.6.2 Example 2
F.2 File Permissions in LTFS
F.2.1 Unix Permissions:
F.2.2 POSIX ACLs:
F.2.3 NFSv4 ACLs:
F.2.4 NTFS ACLs:
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