reiserfstune


SYNOPSIS
       reiserfstune  [  -f  ] [ -h | --help ] [ -j | --journal-device FILE ] [
       --no-journal-available ] [ --journal-new-device FILE ]  [  --make-jour-
       nal-standard  ] [ -s | --journal-new-size N ] [ -o | --journal-new-off-
       set N ] [ -t | --max-transaction-size N ] [ -b | --add-badblocks file ]
       [ -B | --badblocks file ] [ -u | --uuid UUID ] [ -l | --label LABEL ] [
       -c | --check-interval interval-in-days ]  [  -C  |  --time-last-checked
       timestamp  ]  [ -m | --max-mnt-count count ] [ -M | --mnt-count count ]
       device

DESCRIPTION
       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 approx-
       imately 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).

OPTIONS
       -h | --help
              Print usage information and exit.

       -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  sepa-
              rate  device  from  the  main  data  device  (although it can be
              avoided with --no-journal-available). If you don't specify jour-
              nal  device by this option, reiserfstune suppose that journal is
              on main device.

       --no-journal-available
              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
              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  filesys-
              tem.   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 par-
              tition that device.

        -t | --maximal-transaction-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  incor-
              rectly, 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 ker-
              nel 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.

       --make-journal-standard
              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 jour-
              nal 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  hypthens,
              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.

       -C | --time-last-checked timestamp
              Set  the  time  the filesystem was last checked using fsck.reis-
              erfs. This can be useful in scripts which use a  Logical  Volume
              Manager  to make a consistent snapshot of a filesystem, and then
              check the filesystem during off hours to  make  sure  it  hasn't
              been  corrupted due to hardware problems, etc. If the filesystem
              was clean, then this option can be used to set the last  checked
              time on the original filesystem. The format of time-last-checked
              is the international date format, with an optional  time  speci-
              fier,  i.e.   YYYYMMDD[HH[MM[SS]]].  The  keyword  now  is  also
              accepted, in which case the last checked time will be set to the
              current time.

       -m | --max-mnt-count max-mount-count
              Adjust the number of mounts after which the filesystem  will  be
              checked by fsck.reiserfs(8).  If max-mount-count  is  "disable",
              the  number  of  times  the filesystem is mounted will be disre-
              garded by fsck.reiserfs(8) and the kernel. A value of  "default"
              will restore the compile-time default.

              Staggering  the  mount-counts  at which filesystems are forcibly
              checked will avoid all filesystems being  checked  at  one  time
              when using journaled filesystems.

              You  should  strongly  consider  the  consequences  of disabling
              mount-count-dependent  checking  entirely.   Bad  disk   drives,
              cables,  memory,  and kernel bugs could all corrupt a filesystem
              without marking the filesystem dirty or in error.   If  you  are
              using  journaling on your filesystem, your filesystem will never
              be marked dirty, so it will not normally be checked.  A filesys-
              tem error detected by the kernel will still force an fsck on the
              next reboot, but it may already be too late to prevent data loss
              at that point.

              This  option  requires  a kernel which supports incrementing the
              count on each mount. This feature has not been incorporated into
              kernel versions older than 2.6.25.

              See also the -c option for time-dependent checking.

       -M | --mnt-count count
              Set the number of times the filesystem has been mounted.  If set
              to a greater value than the max-mount-counts  parameter  set  by
              the -m option, fsck.reiserfs(8) will check the filesystem at the
              next reboot.

POSSIBLE SCENARIOS OF USING REISERFSTUNE:
       1. 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
              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
              using /dev/hda1 under patched kernel

AUTHOR
       This  version  of  reiserfstune  has  been  written by Vladimir Demidov
       <vova@namesys.com> and Edward Shishkin <edward@namesys.com>.

BUGS
       Please   report   bugs   to   the   ReiserFS   developers    <reiserfs-
       dev@namesys.com>, providing as much information as possible--your hard-
       ware, kernel, patches, settings, all printed messages; check the syslog
       file for any related information.

SEE ALSO
       reiserfsck(8), debugreiserfs(8), mkreiserfs(8)





Reiserfsprogs-3.6.21             January 2009                  REISERFSTUNE(8)
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