xen-users-bounces@xxxxxxxxxxxxxxxxxxx a écrit sur 10/01/2008 01:09:18 :
> Greetings all!
>
> I emailed a little while ago about an issue similar to this one but am
> having issues with it....
>
> I have a Xen VM sitting on an LVM volume. I want to grow a file system
> in the VM. So I 'lvextend' the LVM volume first from 24GB to 64.4GB.
> No problems there. Then I boot the VM and run parted:
We don't boot the VM at this time. We continue resizing the partitions
from the dom0. If you are resizing the VM root filesystem, you will need
to use this way.
>
> sh-3.1# parted /dev/xvda
> GNU Parted 1.8.1
> Using /dev/xvda
> Welcome to GNU Parted! Type 'help' to view a list of commands.
> (parted) print
>
> Model: Xen Virtual Block Device
> Disk /dev/xvda: 64.4GB
> Sector size (logical/physical): 512B/512B
> Partition Table: msdos
>
> Number Start End Size Type File system Flags
> 1 32.3kB 107MB 107MB primary ext3 boot
> 2 107MB 10.6GB 10.5GB primary ext3
> 3 10.6GB 19.0GB 8390MB primary linux-swap
> 4 19.0GB 24.0GB 5017MB extended
> 5 19.0GB 24.0GB 5017MB logical ext3
>
> (parted) resize 4 19.0GB 64.4GB
> (parted) resize 5 19.0GB 64.4GB
> Error: File system has an incompatible feature enabled.
>
> So I can resize partition 4 with no problems, but can't resize partition
> 5 because of that error. It clearly sees that the 'disk' has more space
> now. Anyone know why I can't resize the filesystem/partition this way?
I don't know why, but I experienced the same problem with parted, so we
use fdisk. You have to delete partition 4 and 5 in your case, then
recreate them with the right size.
>
> I tried deleting the whole partition and re-creating it with the bigger
> size, then re-creating the ext3 file system in it, and that works. But
> when I do that I lose all my data obviously, so I'd like to be able to
> just use the 'resize' command in parted....
Don't recreate your file system !!! Resize it instead.
From the dom0, run kpartx on your LV:
kpartx -a /dev/myvg/mylv
This will create entries in dev/mapper that correspond to your
partitions on the LV, something like:
/dev/mapper/myvg-mylvp1, /dev/mapper/myvg-mylvp2, etc.
Then resize the file system on the growed partition, something like:
resize2fs /dev/mapper/myvg-mylvp5
We used several times this method, it works. If you want to minimize the
time your domU is off, you can perform all steps except the last one
(filesystem resize) while the domU is alive.
Hope this help.
Alain.
>
> Any advice would be greatly appreciated!!
>
> -erich
>
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