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At some point hitherto, Tom Rauschenbach hath spake thusly:
> I have a filesystem that is 39389776 1k blocks. Obviously too big to back up
> on a single CD. I'd like to cut it up into separate file systems that can be
> backed up on CD.
>
> Does anyone know of a clever/fast/convenient way to do this?
Well, what you're asking can't be done without actually copying the data onto
those other (pre-existing) filesystems that you're talking about, but
the good news is it doesn't need to be, at least if I understand you correctly.
Presumably, you have a bunch of directories under the filesystem, such
as in my /usr/local partition:
drwxrwsr-x 5 ddm ddm 512 Feb 9 05:46 Download/
drwxr-xr-x 2 root root 224 Oct 6 02:16 bin/
drwxr-xr-x 3 root root 72 Sep 7 07:47 doc/
drwxr-xr-x 2 root root 104 Sep 7 07:47 etc/
drwxr-xr-x 2 root root 48 Feb 6 1996 games/
drwxr-xr-x 2 root root 48 Feb 6 1996 info/
drwxr-xr-x 5 root root 376 Sep 27 23:59 lib/
drwxr-xr-x 12 root root 288 Sep 6 18:16 man/
drwxr-xr-x 3 root root 72 Sep 22 02:21 netscape/
drwxr-xr-x 2 root root 48 Feb 6 1996 sbin/
drwxr-xr-x 3 root root 72 Sep 7 07:47 share/
drwxrwsr-x 7 root ddm 256 Feb 9 04:42 src/
You now want to make some, or all of these into their own filesystems,
in order to make them all fit on a CD.
So, why not just create ISO images of those directories that you
intend to make into their own filesystem?
To illustrate what I mean, if you had the disk space to store the
ISOs, you could do this:
cd $root_dir_of_filesystem
for dir in `ls`; do
cd $dir
mkisofs -o $fs_with_enough_space_to_hold_the_images/$dir.iso .
done
If you actually can get away with making one ISO per directory, then
since this IS your back-up, there isn't really any need to break the
filesystem down to make smaller ones. Obviously, you'll probably want
to use various options for mkisofs, such as those that let you use
long filenames, etc... but you get the idea. For example, the command
line I usually use for mkisofs is this:
mkisofs -v -r -l -J -T -o ../CD_Images/disc.iso .
I'll leave it as an exercise for the reader to figure out what all the
options do (since I don't remember what they do anyway). :)
If you only want to make seperate filesystems out of a few of the
directories though, say bin, sbin, and share, and then leave the rest
of them all in one filesystem, it's a little bit more complicated.
But not too much so.
First, make your ISOs of the filesystems you want to split. As with
any backup, once you've done this, you should check to make sure the
data is intact. In this case, it's extremely important that you do
this, because you're about to delete the data you just backed up!
Once the ISOs are done cooking onto a CD, and you've taken the time to
verify them, DELETE THE DIRECTORIES YOU BACKED UP. This will leave
you with only the data that you want in your one final filesystem
remaining on the disk. Now make another ISO out of this data, and
verify it too.
All that's left is for you to run (c)fdisk to repartition the
filesystem into enough partitions to make the necessary number of
filesystems, then run mkfs on them, and lay the data that you just
backed up onto them. The easiest way to do that is to mount the
filesystems where they should go, then mount the CD that you made
last, and use tar to copy the filesystem into its new location. Then
mount the other CDs in succession and do the same thing.
That's it!
- --
Derek Martin [EMAIL PROTECTED]
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