-operators@lists.openstack.org
Subject: Re: [Openstack-operators] what is the different in use Qcow2 or Raw in
Ceph
On Thu, May 28, 2015 at 3:21 PM, Fox, Kevin M wrote:
> I've experienced the opposite problem though. Downloading raw images and
> uploading them to the cloud is very slo
t;> Thanks,
> >> Kevin
> >> ________________
> >> From: Dmitry Borodaenko [dborodae...@mirantis.com]
> >> Sent: Thursday, May 28, 2015 12:10 PM
> >> To: David Medberry
> >> Cc: openstack-operators@lists.openstack.org
> &
On Thu, May 28, 2015 at 12:55 PM, Jonathan Proulx wrote:
> On Thu, May 28, 2015 at 3:34 PM, Warren Wang wrote:
>> Even though we're using Ceph as a backend, we still use qcow2 images as our
>> golden images, since we still have a significant (maybe majority) number of
>> users using true ephemera
> To: David Medberry
> Cc: openstack-operators@lists.openstack.org
> Subject: Re: [Openstack-operators] what is the different in use Qcow2 or Raw
> in Ceph
>
> David is right, Ceph implements volume snapshotting at the RBD level,
> not even RADOS level: whole 2 levels of abstraction
Borodaenko [dborodae...@mirantis.com]
>> Sent: Thursday, May 28, 2015 12:10 PM
>> To: David Medberry
>> Cc: openstack-operators@lists.openstack.org
>> Subject: Re: [Openstack-operators] what is the different in use Qcow2 or
>> Raw in Ceph
>>
>> David is right,
>> take a qcow2 and convert it to raw on glance ingest rather then at boot.
>>
>> Thanks,
>> Kevin
>>
>> From: Dmitry Borodaenko [dborodae...@mirantis.com]
>> Sent: Thursday, May 28, 2015 12:10 PM
>> To: David M
dborodae...@mirantis.com>]
> Sent: Thursday, May 28, 2015 12:10 PM
> To: David Medberry
> Cc: openstack-operators@lists.openstack.org
> <mailto:openstack-operators@lists.openstack.org>
> Subject: Re: [Openstack-operators] what is the different in use Qcow2 or Raw
>
.org
> Subject: Re: [Openstack-operators] what is the different in use Qcow2 or
> Raw in Ceph
>
> David is right, Ceph implements volume snapshotting at the RBD level,
> not even RADOS level: whole 2 levels of abstraction above file system.
> It doesn't matter if it's XF
boot.
Thanks,
Kevin
From: Dmitry Borodaenko [dborodae...@mirantis.com]
Sent: Thursday, May 28, 2015 12:10 PM
To: David Medberry
Cc: openstack-operators@lists.openstack.org
Subject: Re: [Openstack-operators] what is the different in use Qcow2 or Raw in
Ceph
Dav
David is right, Ceph implements volume snapshotting at the RBD level,
not even RADOS level: whole 2 levels of abstraction above file system.
It doesn't matter if it's XFS, BtrFS, Ext4, or VFAT (if Ceph supported
VFAT): Ceph RBD takes care of it before individual chunks of an RBD
volume are passed t
yep. It's at the CEPH level (not the XFS level.)
On Thu, May 28, 2015 at 8:40 AM, Stephen Cousins
wrote:
> Hi David,
>
> So Ceph will use Copy-on-write even with XFS?
>
> Thanks,
>
> Steve
>
> On Thu, May 28, 2015 at 10:36 AM, David Medberry
> wrote:
>
>> This isn't remotely related to btrfs. I
Hi David,
So Ceph will use Copy-on-write even with XFS?
Thanks,
Steve
On Thu, May 28, 2015 at 10:36 AM, David Medberry
wrote:
> This isn't remotely related to btrfs. It works fine with XFS. Not sure how
> that works in Fuel, never used it.
>
> On Thu, May 28, 2015 at 8:01 AM, Forrest Flagg
>
This isn't remotely related to btrfs. It works fine with XFS. Not sure how
that works in Fuel, never used it.
On Thu, May 28, 2015 at 8:01 AM, Forrest Flagg
wrote:
> I'm also curious about this. Here are some other pieces of information
> relevant to the discussion. Maybe someone here can clea
I'm also curious about this. Here are some other pieces of information
relevant to the discussion. Maybe someone here can clear this up for me as
well. The documentation for Fuel 6.0, not sure what they changed for 6.1,
[1] states that when using Ceph one should disable qcow2 so that images are
The primary difference is the ability for CEPH to make zero byte copies.
When you use qcow2, ceph must actually create a complete copy instead of a
zero byte copy as it cannot do its own copy-on-write tricks with a qcow2
image.
So, yes, it will work fine with qcow2 images but it won't be as perfor
and better explained here:
http://ceph.com/docs/master/rbd/qemu-rbd/
On Thu, May 28, 2015 at 6:02 AM, David Medberry
wrote:
> The primary difference is the ability for CEPH to make zero byte copies.
> When you use qcow2, ceph must actually create a complete copy instead of a
> zero byte copy as
Hi
Now I try to use Fuel 6.1 deploy openstack Juno, use Ceph as cinder, nova
and glance backend.
In Fuel document suggest if use ceph, suggest use RAW format image.
but if I upload qcow2 image, seem working well.
what is the different use qcow2 and RAW in Ceph?
--
Shake Chen
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