ltfs
ltfs copied to clipboard
amiaopensource
ltfs4archivists
This repository is no longer maintained, please consider using https://github.com/LinearTapeFileSystem/ltfs instead.
======================================================================= Linear Tape File System (LTFS) - Version 3.0.0
Files in this download contain Licensed Materials, property of HP, (C) Copyright 2015 Hewlett Packard Enterprise Development LP.
Files in this download also contain Licensed Materials, property of IBM, (C) Copyright IBM Corp. 2010, 2014
The LTFS software application is an open-source tape file system implemented on dual partition tape drives.
This file is part of the Linear Tape File System package. LTFS is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, version 2.1 of the License.
LTFS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA or download the license from http://www.gnu.org/licenses/.
See the Licensing agreement (COPYING.LIB) when LTFS is downloaded.
Further details on LTFS implementation can be found at www.lto.org/technology/ltfs.html
======================================================================= LTFS usage
-
Build and/or install the LTFS application
Installation instuctions are in INSTALLING.linux/INSTALLING.macosx Information on how to build from source are in BUILDING.linux/BUILDING.macosx/Building.windows
-
Ensure that /usr/local/bin/ is in your command search path
For example: $ export PATH="$PATH:/usr/local/bin"
-
Format the tape cartridge in LTFS format
For Linux: $ mkltfs -d /dev/st0
For Mac OS X: $ mkltfs -d 0
Usage: mkltfs
Available options are:
-d, --device=
LTFS17085I Plugin: Loading "ltotape" driver LTOTAPE backend options: -o log_directory=
Usage example: mkltfs --device=/dev/nst0 --rules="size=100K" mkltfs --device=/dev/nst0 --rules="size=1M/name=.jpg" mkltfs --device=/dev/nst0 --rules="size=1M/name=.jpg:*.png"
-
Mount the formatted tape cartridge $ mkdir /mnt/lto5 $ ltfs /mnt/lto5
ltfs options:
usage: ltfs mountpoint [options]
general options: -o opt,[opt...] mount options -h --help print help -V --version print version
FUSE options: -d -o debug enable debug output (implies -f) -f foreground operation -s disable multi-threaded operation
-o allow_other allow access to other users
-o allow_root allow access to root
-o nonempty allow mounts over non-empty file/dir
-o default_permissions enable permission checking by kernel
-o fsname=NAME set filesystem name
-o subtype=NAME set filesystem type
-o large_read issue large read requests (2.4 only)
-o max_read=N set maximum size of read requests
-o hard_remove immediate removal (don't hide files)
-o use_ino let filesystem set inode numbers
-o readdir_ino try to fill in d_ino in readdir
-o direct_io use direct I/O
-o kernel_cache cache files in kernel
-o [no]auto_cache enable caching based on modification times (off)
-o umask=M set file permissions (octal)
-o uid=N set file owner
-o gid=N set file group
-o entry_timeout=T cache timeout for names (1.0s)
-o negative_timeout=T cache timeout for deleted names (0.0s)
-o attr_timeout=T cache timeout for attributes (1.0s)
-o ac_attr_timeout=T auto cache timeout for attributes (attr_timeout)
-o intr allow requests to be interrupted
-o intr_signal=NUM signal to send on interrupt (10)
-o modules=M1[:M2...] names of modules to push onto filesystem stack
-o max_write=N set maximum size of write requests
-o max_readahead=N set maximum readahead
-o async_read perform reads asynchronously (default)
-o sync_read perform reads synchronously
-o atomic_o_trunc enable atomic open+truncate support
-o big_writes enable larger than 4kB writes
-o no_remote_lock disable remote file locking
Module options:
[subdir] -o subdir=DIR prepend this directory to all paths (mandatory) -o [no]rellinks transform absolute symlinks to relative
[iconv] -o from_code=CHARSET original encoding of file names (default: UTF-8) -o to_code=CHARSET new encoding of the file names (default: UTF-8)
LTFS options:
-o config_file=
453e LTFS17085I Plugin: Loading "ltotape" driver
LTOTAPE backend options:
-o devname=
-
Write files to the LTFS volume For example: $ cp -RL /home/user1 /mnt/lto5/
-
Unmount the tape cartridge This flushes the data buffer of the file system to the tape cartridge, and prepares for eject.
$ umount /mnt/lto5 OR $ fusermount -u /mnt/lto5 (Linux only)
-
If at some time in the future user wishes to remove the LTFS format from the cartridge so that it can be reused for a different purpose, use the unltfs utility. Note that this will IRRETRIEVABLY DESTROY all contents of the cartridge, so use it only when you are sure that you wish to erase the LTFS volume.
$ unltfs -d /dev/st0
unltfs options:
Usage: unltfs
-d, --device=
specifies the tape drive to use -y, --justdoit omits normal verification steps, reformats without further prompting -e --eject eject tape after operation completes successfully -q, --quiet suppresses all progress output -t, --trace displays detailed progress -h, --help shows this help -i, --config= overrides the default config file -b, --backend specifies a different tape backend subsystem -x, --fulltrace displays debug information (verbose) -
If the cartridge gets inconsistent due to power failure or improper unmount or incase of any other failures then user can make it consistent again using the ltfsck utility.
$ ltfsck /dev/st0
ltfsck options
Usage: ltfsck [options] filesys
filesys Device file for the tape drive
Available options are:
-g, --generation=
LTFS17085I Plugin: Loading "ltotape" driver LTOTAPE backend options: -o log_directory=
Usage example: ltfsck /dev/nst0 ltfsck --generation --rollback /dev/nst0 ltfsck --deep-recovery --full-recovery /dev/nst0
Changes from version v2.3.0 to 3.0.0:
- Support for LTO-7 Ultrium SAS standalone tape drives
- LTFS Configurator displays messages indicating the progress of the mount operation
- LTFS Configurator supports custom names for tape drives
- CartridgeBrowser utility supports search based on file attribute values
Changes from version v2.2.1 to 2.3.0:
- Added multidrive support for windows
- Added support for icons and label to indicate the status of the cartridge in windows
- Added support for search option within Cartridge Browser
- Added new utility "LTFS Smart copy" for efficient data transfer from cartridge and content data verification for files on the cartridge.
- Implemented ability to list rollback points of a cartridge without EOD marker (--salvage-rollback-points)
- Installation in Linux (RHEL)is now using RPM package.
- LTFS is built with ICU version 50.1.2
- Added support for RHEL 7.0
- Added support for MacOSX 10.10
- Removed support for SLES
- Defect fixes
Changes from version v2.2.0 to 2.2.1:
- Added 'interactive mode' for mkltfs utility.
- The default 'mkltfs' behavior modified to avoid user confirmation.
- The '--quite' option in 'mkltfs' and 'unltfs' utilities now does not imply '--force'
Changes from version v2.1.1 to 2.2.0:
- Added support for LTFS Spec Version 2.2.0
- Added support for MAM Barcode attribute
- Added support for ICU version 4.8.1.1
- Added support for RHEL 6.5 and RHEL 5.10
- Added support for Windows 2012 R2 and Windows 8.1
- Removed support for MacOSX 10.6
- Defects fixed in Windows and Mac GUI
- Defects fixed in Windows and Mac Installer
- Defects fixed in LTFS core application
Changes from version v2.1.0 to 2.1.1:
- Error fixes in windows installer to support upgrade
- Fix to accept the index rules correctly when supplied using the LTFSConfigurator
- Fix in ltfsck when run with --deep-recovery option
- Fix to mount full tapes as read-only
- Fix to clear the EWSTATE flag when a full tape is rolled back with --erase-history option
- Fixed memory leaks
Changes from version v2.0.0 to 2.1.0:
- Enhanced LTFS driver for small file support(Improve file creation/listing time
when a directory has many small files)
- Improved Wizards and Configuration tool for Windows GUI
- Cartridge utilities can be run directly from LTFSconfigurator
- Default volume name is LTFS_VOLUME
- Enhanced support for LTO CM attributes
- Added support LTFS format specifications 2.1.0
- Added support for symbolic link for Linux and Mac
- Added support for rollback mount/read-only mount
- Added support to save the current index as a xml file on unmount or when 'ltfsck' is run.
- Application can run in background now in Mac.
- Rollback of index is now possible only by specifying the generation number of the index,
rollback using timespec of the index is disabled.
- Implemented signal handlers to handle kill/interrupt signals and unmount the volume even when
the mount is being done.
- Tape can be unformatted by specifying -w option to mkltfs
Changes from version v1.2.2 to v2.0.0:
- Added support for LTO6 tape drives
- Set the Application Format Version MAM attribute when formatting a volume
- Added support for four new virtual extended attributes (VEA's):
ltfs.softwareProduct, ltfs.softwareVendor, ltfs.softwareVersion,
ltfs.softwareFormatSpec
- Improved the handling of a cartridge that was not unmounted properly
- Improved the process for storing a file on the index partition when the
data placement policy is specified
- Modified to update the change time of a file or directory when the VEA
ltfs.modifyTime is written
- Fixed the problem that ltfs.mediaStorageAlert VEA is cleared when another
VEA is read
- Fixed a problem in ltfsck when trying to list rollback points and a corrupt
index is encountered
- Added a check for a write-protected cartridge in mkltfs
Changes from version v1.2.0 to v1.2.2:
- Added the unltfs utility
- Added "-o nosizelimit" option to ltfs
- Improved message reporting for advisory conditions that previously were
being reported as error conditions
- Installer on Mac OS X now tries to create the logfile directory if it
doesn't already exist
- Mac OS X package now includes an application to simplify the management
of an LTFS volume
Changes from version v1.1.0 to v1.2.0:
- Conforms with new LTFS Format Specification 2.0.0
- Backward compatibility with Version 1.0 formated tapes, and built-in
automatic migration mechanism to Version 2.0.0 format
- Improved the parsing and handling of the index information
- Supports standardized virtual extended attribute (VEA) names.
VEA names used in previous release of LTFS become obsolete and
no longer available.
- See Important Note below
- Enhanced the ability to recover the tapes in inconsistent state,
which was caused by unexpected power outage.
- Added a new function to flush the in-memory user data to the tape medium
at pre-defined timing; either sync at file close or sync periodically.
The default behaviour is now to sync the index every five minutes.
- Changed the command line syntax of ltfs and mkltfs command for
specifying the data placement rules
- Check for incompatible media and report problems in a helpful way
- Various minor corrections and updates
Important Note:
Earlier versions of the LTFS application supported the original 1.0 LTFS format specification; version v1.2.0 and later supports the updated 2.0.0 LTFS format specification. LTFS volumes created with application v1.2.0 will not be readable in older versions of the LTFS application, as shown in the following table:
Cartridge written by Cartridge written by Cartridge written by
LTFS application v1.1.0 or earlier v1.2.0 or later v2.1.0 or later
v1.1.0 or earlier Read/Write ok Cannot be mounted N/A
v1.2.0 or later Readable ok; will Read/Write ok N/A automatically be converted to new format if written
v2.1.0 or later Readable ok; will Readable ok; will Read/Write ok automatically be automatically be converted to new converted to new format if written format if written
It is recommended that all instances of LTFS should be updated to latest version to avoid these compatibility issues.
If for some reason it is important to maintain cartridges readable by previous versions of the LTFS application, care should be taken to avoid writing to those cartridges with the new version of the application. This may be accomplished by mounting the volume as read-only, or by using the cartridge write-protect tab to prevent cartridge updates. However this should be regarded as a temporary measure until all the application instances can be updated to latest version.
Limitations:
1. When the tape cartridge is almost full, further write operations will
be prevented. The free space on the tape (e.g. from the df command)
will indicate that there is still some capacity available, but that
is reserved for updating the index when the tape is unmounted.
2. Future mounts of a cartridge that is almost full (has passed the
point at which "early warning" is reported) will mount as Read Only,
to prevent further modifications which may not fit on tape. This
status is cleared when a cartridge is reformatted (using mkltfs) or
when the volume is rolled back erasing history (using ltfsck).
3. (Mac OS X) LTFS does not support moving a folder within LTFS.
Any attempt to move a folder in such a manner will result in an
"operation not permitted" error, and the operation will be ignored.
The user can still move a file within LTFS, and the user can also move
a folder from LTFS to non-LTFS file system or vice versa.
4. (Mac OS X) Mac OS X's Spotlight will not display the files
on LTFS as a result of search.
amiaopensource