Updated information about reproducibility and Linux kernel sr lock
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@ -4,7 +4,7 @@ xorriso.texi.
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xorriso - creates, loads, manipulates and writes ISO 9660 filesystem
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images with Rock Ridge extensions.
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Copyright (C) 2007 - 2024 Thomas Schmitt
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Copyright (C) 2007 - 2025 Thomas Schmitt
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Permission is granted to distribute this text freely.
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INFO-DIR-SECTION Archiving
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@ -287,7 +287,7 @@ character device. E.g.
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By default xorriso will try to map the given address to /dev/hd* and
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/dev/sr*. The command -scsi_dev_family can redirect the mapping from sr
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to scd or sg. The latter does not suffer from the concurrency problems
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which plagued /dev/sr of Linux kernels since version 3 up to 5.5. But
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which plagued /dev/sr of Linux kernels since version 2.6 up to 5.5. But
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it does not yield the same addresses which are used by mount(8) or by
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open(2) for read(2).
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On FreeBSD the device files have names like
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@ -727,16 +727,16 @@ acquire the drive.
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By default, xorriso tries to map Linux drive addresses to /dev/sr*
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before they get opened for operating the drive. This coordinates
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well with other use cases of optical drives, like mount(8). But
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since year 2010 all /dev/sr* share a global lock which allows only
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one drive to process an SCSI command while all others have to wait
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for its completion. This yields awful throughput if more than one
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drive is writing or reading simultaneously. The global lock is not
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applied to device files /dev/sg* and also not if the xorriso drive
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address is prepended by "stdio:".
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So for simultaneous burn runs on modern GNU/Linux it is advisable
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to perform -scsi_dev_family "sg" before any -dev, -indev, or
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-outdev. The drive addresses may then well be given as /dev/sr*
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but will nevertheless get used as the matching /dev/sg*.
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between year 2010 and 2020 all /dev/sr* shared a global lock which
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allowed only one drive to process an SCSI command while all others
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had to wait for its completion. This yieldied awful throughput if
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more than one drive was writing or reading simultaneously. The
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global lock was never applied to device files /dev/sg* and also not
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if the xorriso drive address is prepended by "stdio:".
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So for simultaneous burn runs on GNU/Linux 2.6 to 5.5 it is
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advisable to perform -scsi_dev_family "sg" before any -dev, -indev,
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or -outdev. The drive addresses may then well be given as
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/dev/sr*, but will nevertheless get used as the matching /dev/sg*.
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If you decide so, consider to put the command into a global startup
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file like /etc/opt/xorriso/rc.
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-grow_blindly "off"|predicted_nwa
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@ -6055,8 +6055,19 @@ it is used as time value to set the default of -volume date "uuid", sets
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-boot_image "any" "gpt_disk_guid=" to "volume_date_uuid", -volume_date
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"all_file_dates" to "set_to_mtime", and -iso_nowtime to
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"=$SOURCE_DATE_EPOCH".
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Startup files and program options can override the effect of
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Startup files and program commands can override the effect of
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SOURCE_DATE_EPOCH.
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Be aware that by default xorriso puts its version information into the
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Preparer Id field of the ISO 9660 Primary Volume Descriptor. This may
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be desired in order to clearly define which xorriso version has to be
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used for reproduction. But it may also be undesired because a wider
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range of xorriso versions shall not be excluded from an attempt of
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reproduction.
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Use command -preparer_id with a text other than "@xorriso@" if you want
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to override the default at first production time. This command may also
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be used to explicitly set the preparer id as found in an ISO 9660
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filesystem which shall be reproduced by a different version of xorriso.
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The id can be inquired by command -pvd_info.
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File: xorriso.info, Node: Seealso, Next: Bugreport, Prev: Environ, Up: Top
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@ -6115,7 +6126,7 @@ for libburnia-project.org
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15.2 Copyright
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==============
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Copyright (c) 2007 - 2024 Thomas Schmitt
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Copyright (c) 2007 - 2025 Thomas Schmitt
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Permission is granted to distribute this text freely. It shall only be
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modified in sync with the technical properties of 'xorriso'. If you
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make use of the license to derive modified versions of 'xorriso' then
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@ -6768,55 +6779,55 @@ Node: Model3441
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Node: Media6344
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Node: Methods9265
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Node: Drives11851
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Node: Extras15803
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Node: Processing21905
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Node: Dialog25742
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Node: Commands27431
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Node: ArgSort29108
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Node: AqDrive30602
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Node: Loading37759
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Node: Insert68512
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Node: SetInsert80707
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Node: Manip90943
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Node: CmdFind103439
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Node: Filter125299
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Node: Writing129921
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Node: SetWrite142415
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Node: Bootable173847
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Node: Jigdo206581
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Node: Charset211584
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Node: Exception214913
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Node: DialogCtl221102
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Node: Inquiry223704
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Node: Navigate236399
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Node: Verify248452
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Node: Restore259601
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Node: Emulation271808
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Node: Scripting283384
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Node: Frontend291639
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Node: Examples301265
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Node: ExDevices302443
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Node: ExCreate303104
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Node: ExDialog304404
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Node: ExGrowing305675
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Node: ExModifying306484
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Node: ExBootable306994
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Node: ExCharset307549
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Node: ExPseudo308445
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Node: ExCdrecord309372
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Node: ExMkisofs309692
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Node: ExGrowisofs311589
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Node: ExException312742
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Node: ExTime313200
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Node: ExIncBackup313658
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Node: ExRestore317684
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Node: ExRecovery318630
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Node: Files319202
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Node: Environ320536
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Node: Seealso321284
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Node: Bugreport322084
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Node: Legal322675
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Node: CommandIdx323687
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Node: ConceptIdx342993
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Node: Extras15805
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Node: Processing21907
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Node: Dialog25744
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Node: Commands27433
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Node: ArgSort29110
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Node: AqDrive30604
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Node: Loading37784
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Node: Insert68537
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Node: SetInsert80732
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Node: Manip90968
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Node: CmdFind103464
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Node: Filter125324
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Node: Writing129946
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Node: SetWrite142440
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Node: Bootable173872
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Node: Jigdo206606
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Node: Charset211609
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Node: Exception214938
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Node: DialogCtl221127
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Node: Inquiry223729
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Node: Navigate236424
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Node: Verify248477
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Node: Restore259626
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Node: Emulation271833
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Node: Scripting283409
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Node: Frontend291664
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Node: Examples301290
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Node: ExDevices302468
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Node: ExCreate303129
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Node: ExDialog304429
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Node: ExGrowing305700
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Node: ExModifying306509
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Node: ExBootable307019
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Node: ExCharset307574
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Node: ExPseudo308470
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Node: ExCdrecord309397
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Node: ExMkisofs309717
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Node: ExGrowisofs311614
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Node: ExException312767
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Node: ExTime313225
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Node: ExIncBackup313683
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Node: ExRestore317709
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Node: ExRecovery318655
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Node: Files319227
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Node: Environ320561
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Node: Seealso322000
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Node: Bugreport322800
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Node: Legal323391
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Node: CommandIdx324403
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Node: ConceptIdx343709
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End Tag Table
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