Re: [Xen-users] Resize DomU partition

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

KC LO wrote:

> Thanks for your reply!
> However, I got the following errors on the first command
>
> e2fsck 1.39 (29-May-2006)
> Couldn't find ext2 superblock, trying backup blocks...
> e2fsck: Bad magic number in super-block while trying to open 
> /dev/VolGroup00/vm3
> The superblock could not be read or does not describe a correct ext2
> filesystem.  If the device is valid and it really contains an ext2
> filesystem (and not swap or ufs or something else), then the superblock
> is corrupt, and you might try running e2fsck with an alternate superblock:
>     e2fsck -b 8193 <device>
>
> I guess that the file system is ext3 which got this problem.  Any hints?
The command isn't appropriate for your setup. /dev/VolGroup00/vm3 
does not contain a single filesystem, it has been partitioned in your 
DomU. Just FYI - Ext3 and Ext2 are essentially the same filesystem 
and most of the tools are the same - Ext3 just adds journalling.
You need to connect the block device to your Dom0, Fajar gives the 
command as "xm block-attach 0 ...". As I read the man page, I think 
the command would be "xm block-attach 0 /dev/VolGroup00/vm3 /dev/hde 
W" to connect it as device hde.
Once you've attached it, then you can work with the partitions in it 
- eg "fsck /dev/hde1" to check the filesystem in the first partition.
I'm not sure if any of the common partitioners are capable of 
relocating a partition, but for the standard fdisk you'll need to 
mount the filesystems, copy the files elsewhere, then use fdisk to 
delete the partitions and create new ones of the size you want (this 
WILL destroy all the data in them), create new filesystems and mount 
them, and copy the file back again.
There's a lot to be said for using LVM and creating an lv per 
filesystem. With that setup, you can resize a filesystem by :
- shutdown the DomU
- fsck -f <lv path>
- resize2fs <lv path>
- startup DomU

--
Simon Hobson

WANTED: "Software CD ROM Kit" for Canon CLBP 360-PS printer (Canon 
part no RH6-3612, or possibly RH6-3810, or RH6-3610 might do). I've a 
dead HD and need this CD so I can replace the disk and re-install the 
printer OS on it.
This is NOT the same thing as the printer drivers to load on the 
computer - there's no problem there.
If anyone knows where I might get hold of one I'd be grateful - 
requests to Canon drew a blank, it's been out of support for years.
Alternatively, if anyone has one of these and would let me image 
their hard disk ...
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
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