reiserfstune

REISERFSTUNE(8) System Manager's Manual REISERFSTUNE(8)

NAME
reiserfstune - The tunning 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
ReiserFS and set UUID and LABEL. Note: At the time of writing the re-
located journal was implemented for a special release of ReiserFS, and
was not expected to be put into the mainstream kernel until approxi-
mately 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
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 ef-
fect 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 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 re-
location 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 | --check-interval interval-in-days
Adjust the maximal time between two filesystem checks. A value
of "disable" will disable the time-dependent checking. A value
of "default" will restore the compile-time default.

It is strongly recommended that either -m (mount-count depen-
dent) or -c (time-dependent) checking be enabled to force peri-
odic full fsck.reiserfs(8) checking of the filesystem. Failure
to do so may lead to filesystem corruption (due to bad disks,
cables, memory, or kernel bugs) going unnoticed, ultimately re-
sulting in data loss or corruption.

-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 ac-
cepted, 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
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@namesys.com> and Edward Shishkin <edward@namesys.com>.

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

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

Reiserfsprogs-3.6.27 January 2009 REISERFSTUNE(8)

reiserfstune

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