reiserfstune(8) - phpMan

REISERFSTUNE(8) REISERFSTUNE(8)

NAME
reiserfstune - The tuning tool for the ReiserFS filesystem.

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 Reis-
erFS 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).

OPTIONS
-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 jour-
nal 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.

--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 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 filesystem - 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 | --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 specified 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 con-
firmation.

--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
journal size 8193 blocks (it will be so for instance if you convert standard jour-
nal 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 sepa-
rated 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.

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
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
mount /dev/hda1 and use.

2. 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
using /dev/hda1 under patched kernel

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

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

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

Reiserfsprogs-3.6.19 February 2004 REISERFSTUNE(8)

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