On Tue, 15 Mar 2005 12:17:54 -0300, itamar <[EMAIL PROTECTED]> wrote:
> How to resize a ext3 root_fs ?
Well, let's see an example. Disclaimer : You're on your own.
~$ dd if=/dev/zero of=test.fs bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes transferred in 0.162605 seconds (644860977 bytes/sec)
~$ mkfs.ext3 -F test.fs
mke2fs 1.36 (05-Feb-2005)
Filesystem label=
OS type: Linux
Block size= (log=0)
Fragment size=1024 (log=0)
25688 inodes, 102400 blocks
5120 blocks (5.00%) reserved for the super user
First data block=1
13 block groups
8192 blocks per group, 8192 fragments per group
1976 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 31 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
Note:
[Block size = 1024]
~$ resize2fs test.fs 50M
resize2fs 1.36 (05-Feb-2005)
Resizing the filesystem on test.fs to 51200 (1k) blocks.
The filesystem on test.fs is now 51200 blocks long.
Note:
[The filesystem on test.fs is now 51200 blocks long.]
[Block size = 1024]
[New filesystem size is 51200*1024 bytes = 52428800 bytes]
Now you can use dd to extract the new filesystem from the bigger file.
dd if=test.fs of=new.fs bs=1 count=52428800 (this would be slow)
~$ dd if=test.fs of=new.fs bs=100 count=524288
524288+0 records in
524288+0 records out
52428800 bytes transferred in 1.705196 seconds (30746493 bytes/sec)
~$ fsck.ext3 new.fs
e2fsck 1.36 (05-Feb-2005)
new.fs: clean, 11/13832 files, 5879/51200 blocks
I wrote a simple wrapper to the "truncate" system call that you can
use if you don't have enough free space to use "dd" or if you're sure
of what you're doing. See:
http://arhuaco.blogspot.com/2005/02/how-do-i-truncate-file-in-linux.html
Regards,
Nelson.-
>
> e2fsck -j ext3 filename
>
> dd if=/dev/zero of=filename bs=1 count=1 seek=newsize conv=notrunc
>
> resize2fs -p filename
>
> e2fsck -j ext3 filename
>
> this works ?
>
> Itamar Reis Peixoto
> +55 (34) 3238 3845
> e-mail : [EMAIL PROTECTED]
> http://vps.ispbrasil.com.br
--
Homepage : http://geocities.com/arhuaco
The first principle is that you must not fool yourself
and you are the easiest person to fool.
-- Richard Feynman.
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