Welcome to the Reiser4 Wiki, the Wiki for users and developers of the ReiserFS and Reiser4 filesystems.

For now, most of the documentation is just a snapshot of the old Namesys site (archive.org, 2007-09-29).

There was also a Reiser4 Wiki (archive.org, 2007-07-06) once on pub.namesys.com.


From Reiser4 FS Wiki
Jump to: navigation, search



reiserfstune - The tuning tool for the ReiserFS filesystem.


 reiserfstune [ -f ]
              [ -j | --journal-device FILE ]
              [ --no-journal-available ]
              [ --journal-new-device FILE ]
              [ --make-journal-standard ]
              [ -s | --journal-new-size N ]
              [ -o | --journal-new-offset N ]
              [ -t | --trans-max-size N ]
              [ -b | --add-badblocks file ]
              [ -B | --badblocks file ] [ -u | --uuid UUID ] [ -l | --label LABEL ] device


reiserfstune is used for tuning the ReiserFS. It can change two journal parameters (the journal size and the maximum transaction size), and it can move the journal's location to a new specified block device. (The old ReiserFS's journal may be kept unused, or discarded at the user's option.) Besides that reiserfstune can store the bad block list to the ReiserFS and set UUID and LABEL.

Note: At the time of writing the relocated journal was implemented for a special release of ReiserFS, and was not expected to be put into the mainstream kernel until approximately Linux 2.5. This means that if you have the stock kernel you must apply a special patch. Without this patch the kernel will refuse to mount the newly modified file system. We will charge $25 to explain this to you if you ask us why it doesn't work.

Perhaps the most interesting application of this code is to put the journal on a solid state disk.

device is the special file corresponding to the newly specified block device (e.g /dev/hdXX for IDE disk partition or /dev/sdXX for the SCSI disk partition).


 -j | --journal-device FILE
 FILE is the file name of the block device the file system has the
 current journal (the one prior to running reiserfstune) on. This
 option is required when the journal is already on a separate device
 from the main data device (although it can be avoided with 
 --no-journal-available). If you don't specify journal device by 
 this option, reiserfstune suppose that journal is on main device.
 allows reiserfstune to continue when the current journal's block 
 device is no longer available. This might happen if a disk goes 
 bad and you remove it (and run fsck).
 --journal-new-device FILE
 FILE is the file name of the block device which will contain the
 new journal for the file system. If you don't specify this,
 reiserfstune supposes that journal device remains the same.
 -s | --journal-new-size N
 N is the size parameter for the new journal. When journal is to be
 on a separate device - its size defaults to number of blocks that
 device has. When journal is to be on the same device as the 
 filesytem - its size defaults to amount of blocks allocated for 
 journal by mkreiserfs when it created the filesystem. Minimum
 is 513 for both cases.
 -o | --journal-new-offset N
 N is an offset in blocks where journal will starts from when 
 journal is to be on a separate device. Default is 0. Has no effect
 when journal is to be on the same device as the filesystem. Most
 users have no need to use this feature. It can be used when you 
 want the journals from multiple filesystems to reside on the same
 device, and you don't want to or cannot partition that device.
 -t | --trans-max-size N
 N is the maximum transaction size parameter for the new journal.
 The default, and max possible, value is 1024 blocks. It should
 be less than half the size of the journal. If specifed incorrectly,
 it will be adjusted.
 -b | --add-badblocks file
 File is the file name of the file that contains the list of blocks
 to be marked as bad on the fs. The list is added to the fs list 
 of bad blocks.
 -B | --badblocks file
 File is the file name of the file that contains the list of blocks
 to be marked as bad on the fs. The bad block list on the fs is 
 cleared before the list specified in the File is added to the fs.
 -f | --force
 Normally reiserfstune will refuse to change a journal of a file
 system that was created before this journal relocation code. This
 is because if you change the journal, you cannot go back (without
 special option --make-journal-standard) to an old kernel that 
 lacks this feature and be able to use your filesytem. This option
 forces it to do that. Specified more than once it allows to avoid
 asking for confirmation.
 As it was mentioned above, if your file system has non-standard
 journal, it can not be mounted on the kernel without journal 
 relocation code. The thing can be changed, the only condition is
 that there is reserved area on main device of the standard journal
 size 8193 blocks (it will be so for instance if you convert 
 standard journal to non-standard). Just specify this option when 
 you relocate journal back, or without relocation if you already
 have it on main device.
 -u | --uuid UUID
 Set the universally unique identifier (UUID) of the filesystem to
 UUID (see also uuidgen(8)).
 The format of the UUID is a series of hex digits separated by 
 hyphens, like this: "c1b9d5a2-f162-11cf-9ece-0020afc76f16".
 -l | --label LABEL
 Set the volume label of the filesystem. LABEL can be at most 16 
 characters long; if it is longer than 16 characters, reiserfstune
 will truncate it.


  • You have ReiserFS on /dev/hda1, and you wish to have it working with its journal on the device /dev/journal
    • boot kernel patched with special "relocatable journal support" patch
    • reiserfstune /dev/hda1 --journal-new-device /dev/journal -f
    • mount /dev/hda1 and use.
  • You would like to change max transaction size to 512 blocks
    • reiserfstune -t 512 /dev/hda1
  • You would like to use your file system on another kernel that doesn't contain relocatable journal support.
    • umount /dev/hda1
    • reiserfstune /dev/hda1 -j /dev/journal --journal-new-device /dev/hda1 --make-journal-standard
  • You would like to have ReiserFS on /dev/hda1 and to be able to switch between different journals including journal located on the device containing the filesystem.
    • boot kernel patched with special "relocatable journal support" patch
    • mkreiserfs /dev/hda1
  • You got solid state disk (perhaps /dev/sda, they typically look like scsi disks)
    • reiserfstune --journal-new-device /dev/sda1 -f /dev/hda1
  • Your scsi device dies, it is three in the morning, you have an extra IDE device lying around
    • reiserfsck --no-journal-available /dev/hda1 or
    • reiserfsck --rebuild-tree --no-journal-available /dev/hda1
    • reiserfstune --no-journal-available --journal-new-device /dev/hda1 /dev/hda1


This version of reiserfstune has been written by Vladimir Demidov and Edward Shishkin <edward.shishkin@gmail.com>.


Please report bugs to the ReiserFS developers <reiserfs-devel@vger.kernel.org>, providing as much information as possible--your hardware, kernel, patches, settings, all printed messages; check the syslog file for any related information.


Personal tools