btrfs plans for 15.10/16.04?

[Dimitri John Ledkov]

On 21 Apr 2015 2:07 pm, "Martinx - ジェームズ" <thiagocmartinsc at gmail.com> wrote:
>
> On 21 April 2015 at 16:36, Bryan Quigley <bryan.quigley at canonical.com>
wrote:
>>
>> Hi there,
>>
>> I'm just wondering if there are any plans to revisit btrfs as the
default filesystem before the next LTS?
>>

So on Suse, btrfs is used for rootfs but not user storage (e.g. /home is on
xfs). I see that attractive, as /usr is mostly read-only and only updated
with controlled tools.

>> Some key drivers I see are:
>>  - If we want our app/snappy story to converge with systemds [1]
>>  - LXC is even awesomer on btrfs (fast copies)
>>
>> AFAICT the last time this was condired was in the 12.10/13.04 timeframe
[2].
>>
>> Thanks!
>> Bryan
>>
>>
>> [1]
http://0pointer.net/blog/revisiting-how-we-put-together-linux-systems.html
>> [2]
https://blueprints.launchpad.net/ubuntu/+spec/foundations-r-btrfs-requirements
>
>
> Hey guys!
>
> Let me ask something here...
>
> Does Canonical / Ubuntu have plans to kick apt/dpkg in favor of some kind
of "systemd install my-package"?
>

That's not inline with systemd upstream. It only has support for offline
updates with reboot. (See needs update conditions etc.)

However see snappy / click and system image updates.

> About BTRFS, it still can not be used to host KVM QCow2 images, neither
"/var/lib/mysql" directories... Since it lacks support for DIRECT_IO.
>

Setting the flag to disable copy on write is available however.

> Cheers!
> Thiago
>
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