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Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format |
Date: |
Fri, 10 Sep 2010 14:12:40 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.12) Gecko/20100907 Fedora/3.0.7-1.fc12 Thunderbird/3.0.7 |
Am 10.09.2010 13:43, schrieb Stefan Hajnoczi:
>>>>> By creating two code paths within qcow2.
>>>>
>>>> You're creating two code paths for users.
>>>
>>> No, I'm creating a single path: QED.
>>>
>>> There are already two code paths: raw and qcow2. qcow2 has had such a bad
>>> history that for a lot of users, it's not even a choice.
>>
>> qcow2 exists, people use it, and by the time qed is offered on distros (even
>> more on enterprise distros), there will be a lot more qcow2 images. Not
>> everyone runs qemu.git HEAD.
>>
>> What will you tell those people? Upgrade your image? They may still want
>> to share it with older installations. What if they use features not present
>> in qed? Bad luck?
>>
>> qcow2 is going to live forever no matter what we do.
>
> It should be possible to do (live) upgrades for supported images.
That still leaves those qcow2 images that use features not supported by
qed. Just a few features missing in qed are internal snapshots, qcow2 on
block devices, compression, encryption. So qed can't be a complete
replacement for qcow2 (and that was the whole point of doing qed). If
anything, it can exist besides qcow2.
Kevin
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, (continued)
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Christoph Hellwig, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Christoph Hellwig, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Anthony Liguori, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Stefan Hajnoczi, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Anthony Liguori, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format,
Kevin Wolf <=
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Stefan Hajnoczi, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Stefan Hajnoczi, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Anthony Liguori, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Christoph Hellwig, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Kevin Wolf, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Anthony Liguori, 2010/09/10
- Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format, Avi Kivity, 2010/09/10