[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Resizing Partitions



On Wed, May 31, 2000 at 10:52:33AM +0200, Andre Berger wrote:
> Is there a way to change the partition scheme without data loss or
> re-formatting? I have a PowerBook 3400/potato. My partition scheme is: 

im not a big fan of partition resizing, you really need to make a
backup anyway becuase if anything goes wrong well...

> /dev/hda
>         #                    type name                length   base    ( size )  system
> /dev/hda1     Apple_partition_map Apple                   63 @ 1       ( 31.5k)  Partition map
> /dev/hda2          Apple_Driver43 Macintosh               54 @ 64      ( 27.0k)  Driver 4.3
> /dev/hda3          Apple_Driver43 Macintosh               74 @ 118     ( 37.0k)  Driver 4.3
> /dev/hda4        Apple_Driver_ATA Macintosh               54 @ 192     ( 27.0k)  Unknown
> /dev/hda5        Apple_Driver_ATA Macintosh               74 @ 246     ( 37.0k)  Unknown
> /dev/hda6           Apple_Patches Patch Partition        512 @ 320     (256.0k)  Unknown
> /dev/hda7         Apple_UNIX_SVR2 /                  2137464 @ 832     (  1.0G)  Linux native
> /dev/hda8         Apple_UNIX_SVR2 swap                163840 @ 2138296 ( 80.0M)  Linux swap
> /dev/hda9               Apple_HFS untitled 3          511973 @ 2302136 (250.0M)  HFS
> /dev/hda10             Apple_Free Extra                 8291 @ 2814109 (  4.0M)  Free space
> 
[snip fdisk crap]
> 
> I would like to grow my ext2 /dev/hda7 at the expense of the mac
> partition /dev/hda9 (for which 50mb should be enough). Plan B: If possible, I
> would also like to add an Apple_Bootstrap partition for yaboot.

are you planning on deleting macos permanently?  or reinstalling it in
a smaller partition?  i am going to assume deletion as 250MB is
already barly enough space for macos. 

i would say its possible, but you have to do it carefully and while
quite sober ;-)

first don't make the mistake of changing the partition size and then
expecting the filesystem to suddenly have more space, it does not work
that way.  first you would have to resize the partition and then
resize the filesystem with ext2resize.  i would say you could delete
hda8 and hda9 then resize hda7 to fill that space leaving 800K for
bootstrap, add the bootstrap partition last in this case is fine since
you have no more macos partitions.  so you would have something like
this:

> /dev/hda
>         #                    type name                length   base    ( size )  system
> /dev/hda1     Apple_partition_map Apple                   63 @ 1       ( 31.5k)  Partition map
> /dev/hda2          Apple_Driver43 Macintosh               54 @ 64      ( 27.0k)  Driver 4.3
> /dev/hda3          Apple_Driver43 Macintosh               74 @ 118     ( 37.0k)  Driver 4.3
> /dev/hda4        Apple_Driver_ATA Macintosh               54 @ 192     ( 27.0k)  Unknown
> /dev/hda5        Apple_Driver_ATA Macintosh               74 @ 246     ( 37.0k)  Unknown
> /dev/hda6           Apple_Patches Patch Partition        512 @ 320     (256.0k)  Unknown
> /dev/hda7         Apple_UNIX_SVR2 /                  2137464 @ 832     (  1.0G)  Linux native
> /dev/hda8         Apple_UNIX_SVR2 swap                163840 @ 2138296 ( 80.0M)  Linux swap
> /dev/hda9	    Apple_Bootstrap bootstrap           XXXXXX @ XXXXXXX (  800K)  Unknown

the numbers are wrong, im too lazy/tired to calculate them, but your /
partition would be about 254MB larger.  at that point you would need
to run ext2resize, from a boot floppy/CD whatever in order to actually
reclaim the space.

AFAIK that would work but i have never tried it, when i need to change
partitioning i just clear the table and do it from scratch.  

that is really what i would reccommend you do, since i would NEVER
attempt to screw with this without a complete backup of your data, and
if you have a backup why not just do the partitioning right from
scratch in the right order? 

also this is an example of why monolithic huge / partitions are bad,
if you had farmed your partitions into / /var /usr /home it would
probably be easier to make these adjustments without as much
inconvenience.  just my $0.02

> I could also swap my data to another HDD if necessary; it would be
> fine to use this ext.HDD as a mirror for my int.HDD. Is there a tool
> that mirrors /dev/hda7 including all ext2 permissions?

if you make a filesystem you can just use cpio to exactly duplicate
it, then cpio it back to the original, i used this method to transfer
the contents of my old 6GB hard disk to a new 20GB, worked very well,
no permissions or link problems at all.  

the other thing that might work is creating a tar archive directly to
the raw disk device, i have never done that so im not sure that would
work or not.  (it works with tapes of course so i would think disks
too...) 

if the disks are the same size (EXACTLY!) you can use dd, but i don't
like that idea much. 

my advice is backup and partition like so:

/dev/hda1         Apple_partition_map Apple          
/dev/hda2         Apple_Bootstrap bootstrap  ( 800K)    
/dev/hda3         Apple_UNIX_SVR2 /          ( 64MB)
/dev/hda4         Apple_UNIX_SVR2 swap       ( 96MB)
/dev/hda5,6,7...  Apple_UNIX_SVR2 /usr /var /home /usr/local and other assorted partitions


none of that apple driver crap (unless you are installing macos again) 

partition tables look SOO much nicer without all that apple cruft in
there ;-)

-- 
Ethan Benson
http://www.alaska.net/~erbenson/

Attachment: pgpn9RLb6VW8M.pgp
Description: PGP signature


Reply to: