VM Image with btrfs in lvm on second partition?

[Christian Schneemann]

Hi,

a customer asked for a special disk layout in his VMs like he has on his
baremetal machines.

What he asked for:

- disk with 2 partitions
- LVM in second partition
- btrfs on volume in LVM

I think this is not possible, at least LVM and btrfs configuration share
the same systemdisk element.

Is it possible to manage the partitioning thing by anyway?




Regards,
Christian

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Mail: schne...@b1-systems.de

B1 Systems GmbH
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[J.Wit...@mindef.nl]

You mean "possible on general" or specifically in kiwi??

In general, it is no problem.
Most of the OBS subjects >40, i have with btrfs on dedicated lvm's...


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[Christian Schneemann]

Hi,

On 09/01/2015 11:23 AM, J.Wit...@mindef.nl wrote:
> You mean "possible on general" or specifically in kiwi??

of course I mean in kiwi, this is the kiwi-images mailinglist, isn't it?


Regards,
Christian

[Marcus Schäfer]

Hi,

> a customer asked for a special disk layout in his VMs like he has on his
> baremetal machines.
>
> What he asked for:
>
> - disk with 2 partitions
> - LVM in second partition
> - btrfs on volume in LVM
>
> I think this is not possible, at least LVM and btrfs configuration share
> the same systemdisk element.
>
> Is it possible to manage the partitioning thing by anyway?

It's possible in kiwi to do that

you can set:


<type ... filesystem="btrfs" .../>

<systemdisk preferlvm="true">
<volume name="foo"/>
</systemdisk>

</type>


This will use LVM for the volume management and each volume you
configure will take a btrfs filesystem

It is questionable if that makes sense since btrfs has its own
volume management and of course you don't benefit much from btrfs
snapshoting, quotas and other features it provides

Regards,
Marcus
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-------------------------------------------------------

[Christian Schneemann]

On 09/01/2015 09:48 PM, Marcus Schäfer wrote:
> Hi,
>
>> a customer asked for a special disk layout in his VMs like he has on his
>> baremetal machines.
>>
>> What he asked for:
>>
>> - disk with 2 partitions
>> - LVM in second partition
>> - btrfs on volume in LVM
>>
>> I think this is not possible, at least LVM and btrfs configuration share
>> the same systemdisk element.
>>
>> Is it possible to manage the partitioning thing by anyway?
>
> It's possible in kiwi to do that
>
> you can set:
>
>
> <type ... filesystem="btrfs" .../>
>
> <systemdisk preferlvm="true">
> <volume name="foo"/>
> </systemdisk>
>
> </type>

hm, seems that is not yet in the documentation.. (or at least that one I
used)

>
>
> This will use LVM for the volume management and each volume you
> configure will take a btrfs filesystem
>
> It is questionable if that makes sense since btrfs has its own
> volume management and of course you don't benefit much from btrfs
> snapshoting, quotas and other features it provides

Yes, thats not what is expected. The result should be on VG with one LV
in it that contains the btrfs volumes..


Regards,
Christian

>
> Regards,
> Marcus

[Marcus Schäfer]

Hi,

> Yes, thats not what is expected. The result should be on VG with one LV
> in it that contains the btrfs volumes..

I'm sorry this setup is not supported