Ето малко copy&paste как да преминем на журнал :
We'd first suggest you copy everything on your regular ext2 partition
to the spare partition. If the spare is smaller than your original
data, compress your whole partition into a tar.gz file on the spare
partition. After making sure this worked correctly and all your files
are there (and/or you have a good backup!

'>, copy the /bin, /etc, /lib
and /sbin directories (plus the mkreiserfs utility) to the spare
partition. This is in preparation for booting off that partition so
you can reformat the original ext2 partition as reiserfs.
Next, make a boot diskette with a ReiserFS-enabled kernel on it (don't
forget to run lilo on the diskette!

'> and make sure it works (so you
won't get stuck with an unbootable system.) After booting this
diskette, you should get a lilo: prompt. Enter "linux
root=/dev/hd init=/bin/bash" at
the lilo prompt. Your system should boot and stop at a bare bash "#"
prompt.
At the prompt (now off of your spare partition), try tar ztvf to test
the backup archive if you did the compression step above (just to make
sure you can get at your data still.) If you're convinced that you
want to go ahead with the conversion, run mkreiserfs on your original
ext2 partition, ERASING ALL DATA THERE (but you have the backup of
course.) Then, mount the new partition somewhere as reiserfs and cd to
the mount directory. Make sure the amount of free disk space is what
you expected (just as a double check), and untar your backup archive
to restore everything.
At this point, your data is on ReiserFS and you should be able to
rerun lilo (make sure your default kernel supports ReiserFS!

'> on your
normal root partition to get the kernel set up again. Unmount all
partitions and reboot. If everything goes as planned, Linux should say
"VFS: Mounted root ... as reiserfs" at some point, and you should be
all set.
If the system doesn't boot, etc. you have your backup diskette and can
just boot off the spare partition to fix things. Make sure you have
the right ReiserFS-enabled kernel installed beforehand and all
configuration files (especially lilo.conf) are up to date.