Anand Buddhdev <[EMAIL PROTECTED]> writes:
> On Fri, May 24, 2002 at 07:47:02PM -0300, Ted Gervais wrote:
>
>> > > I've been told that you can change a file system between ext2 and ext3
>> > > without corrupting the data. How do you do that?
>> >
>> > tune2fs -j /dev/hda1
>> >
>> > adds a journal to device /dev/hda1, effectively converting it to ext3. Now
>> > you need to remount it as ext3, and also edit /etc/fstab and change the
>> > FS type from ext2 to ext3, so that at the next reboot, it is mounted
>> > correctly.
>>
>> What about going back to ext2? Is that possible without doing a whole new
>> installation??
>
> You can mount an ext3 FS as ext2; no problem. The kernel will simply
> ignore the journal, and the FS will behave exactly as it was before under
> ext2. That's the beauty of the system. You can go back and forth between
> the two systems. If you want to permanently go back from ext3 to ext2,
> then you have to use tune2fs to remove the journal (although it is safe
> to leave it there even if using the system as ext2).
Also, you can use
tune2fs -O ^has_journal /dev/hda1
(which should be pronounced something like "set options to exclude
has_journal") to get rid of the journal on disk (if you want to use
some ext2 only tools on the fs which complain about the journal being
present - PartitionMagic might fall into that category).
IIRC to do this the filesystem must not be mounted read/write; so
going single-user ('telinit S' or booting with 'S' appended to kernel
command line) and doing
mount -o remount,ro /dev/hda1
should do the trick. Remember to edit fstab back to ext2
*beforehands*.
For those running custom kernels with ext3 as a module: Also remember
to rebuild the initrd (after editing fstab), otherwise the root root
fs cannot be mounted... Not insurmountable using the install cd/rescue
mode, but unneccesary hassle.
So long,
Joe
--
"I use emacs, which might be thought of as a thermonuclear
word processor."
-- Neal Stephenson, "In the beginning... was the command line"
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