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发信人: cybergene (基因～也许以后～～), 信区: Linux
标  题: [HowTo]Change / from e2fs to reiserfs
发信站: BBS 水木清华站 (Sun Nov 12 01:26:48 2000)

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.



-------------------------------------------------------------
Matt T. Yourst Massachusetts Institute of Technology
yourst@mit.edu 617.225.7690
513 French House 476 Memorial Drive - Cambridge, MA 02136
-------------------------------------------------------------

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