Re: RE [Xen-users] Resizing partitions on a VM sitting on a LVM volume

[Erich Weiler <weiler@xxxxxxxxxxxx>]

That worked beautifully.  Thanks for your help on this!

-erich

Alain BARTHE wrote:
> 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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>  > Xen-users@xxxxxxxxxxxxxxxxxxx
>  > http://lists.xensource.com/xen-users
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