Am 14.08.2014 um 22:53 hat Xingbo Wu geschrieben:
> >> >> The main trick of QED was to introduce a dirty flag, which allowed to
> >> >> call fdatasync() less often because it was okay for image metadata to
> >> >> become inconsistent. After a crash, you have to repair the image then.
> >> >>
> >> >
>> >> The main trick of QED was to introduce a dirty flag, which allowed to
>> >> call fdatasync() less often because it was okay for image metadata to
>> >> become inconsistent. After a crash, you have to repair the image then.
>> >>
>> >
>> > I'm very curious about this dirty flag trick. I was su
Am 14.08.2014 um 04:42 hat Xingbo Wu geschrieben:
> On Wed, Aug 13, 2014 at 5:04 PM, Xingbo Wu wrote:
> > On Wed, Aug 13, 2014 at 2:32 PM, Kevin Wolf wrote:
> >> Am 13.08.2014 um 18:38 hat Xingbo Wu geschrieben:
> >>> On Wed, Aug 13, 2014 at 11:54 AM, Kevin Wolf wrote:
> >>> > Am 12.08.2014 um 0
On Wed, Aug 13, 2014 at 5:04 PM, Xingbo Wu wrote:
> On Wed, Aug 13, 2014 at 2:32 PM, Kevin Wolf wrote:
>> Am 13.08.2014 um 18:38 hat Xingbo Wu geschrieben:
>>> On Wed, Aug 13, 2014 at 11:54 AM, Kevin Wolf wrote:
>>> > Am 12.08.2014 um 01:38 hat 吴兴博 geschrieben:
>>> >> Hello,
>>> >>
>>> >> The
On 08/13/2014 03:04 PM, Xingbo Wu wrote:
>>> I read several messages from this thread: "[RFC] qed: Add QEMU
>>> Enhanced Disk format". To my understanding, if the new format can be
>>> acceptable to the community:
>>> It needs to retain all the key features provided by qcow2,
>>> especially for
On Wed, Aug 13, 2014 at 2:32 PM, Kevin Wolf wrote:
> Am 13.08.2014 um 18:38 hat Xingbo Wu geschrieben:
>> On Wed, Aug 13, 2014 at 11:54 AM, Kevin Wolf wrote:
>> > Am 12.08.2014 um 01:38 hat 吴兴博 geschrieben:
>> >> Hello,
>> >>
>> >> The introduction in the wiki page present several advantages of
Am 13.08.2014 um 18:38 hat Xingbo Wu geschrieben:
> On Wed, Aug 13, 2014 at 11:54 AM, Kevin Wolf wrote:
> > Am 12.08.2014 um 01:38 hat 吴兴博 geschrieben:
> >> Hello,
> >>
> >> The introduction in the wiki page present several advantages of qcow2
> >> [1].
> >> But I'm a little confused. I really
On Wed, Aug 13, 2014 at 11:54 AM, Kevin Wolf wrote:
> Am 12.08.2014 um 01:38 hat 吴兴博 geschrieben:
>> Hello,
>>
>> The introduction in the wiki page present several advantages of qcow2 [1].
>> But I'm a little confused. I really appreciate if any one can give me some
>> help
>> on this :).
>>
>>
Am 12.08.2014 um 01:38 hat 吴兴博 geschrieben:
> Hello,
>
> The introduction in the wiki page present several advantages of qcow2 [1].
> But I'm a little confused. I really appreciate if any one can give me some
> help
> on this :).
>
> (1) Currently the raw format doesn't support COW. In other
Am 12.08.2014 um 17:30 hat Eric Blake geschrieben:
> On 08/12/2014 08:14 AM, 吴兴博 wrote:
> >>> However FVD seems to have been ignored by community.
> >>
> >> Care to give a pointer to a URL describing the FVD format?
> >>
> >> http://lists.nongnu.org/archive/html/qemu-devel/2011-01/msg00398.html
> >
On Tue, 08/12 12:22, Xingbo Wu wrote:
> On Tue, Aug 12, 2014 at 11:30 AM, Eric Blake wrote:
>
> > On 08/12/2014 08:14 AM, 吴兴博 wrote:
> > >>> However FVD seems to have been ignored by community.
> > >>
> > >> Care to give a pointer to a URL describing the FVD format?
> > >>
> > >> http://lists.non
On Tue, Aug 12, 2014 at 03:23:38PM -0400, Xingbo Wu wrote:
> would be very space efficient for distribution :).
> Would you consider replace xz with lz4? it has faster decompression speed
> (~500MB/s)[1] and client-side decompression would be made painless.
No. The main benefit of xz is it has a
On Tue, Aug 12, 2014 at 2:52 PM, Richard W.M. Jones
wrote:
> On Tue, Aug 12, 2014 at 07:46:30PM +0100, Daniel P. Berrange wrote:
> > Taking the compression feature - arguably the biggest benefit of that
> > is when you distribute disk images. eg if someone provides a root disk
> > image on a web
On Tue, Aug 12, 2014 at 07:46:30PM +0100, Daniel P. Berrange wrote:
> Taking the compression feature - arguably the biggest benefit of that
> is when you distribute disk images. eg if someone provides a root disk
> image on a web server, using compression in qcow2 can dramatically
> lower the downl
On Mon, Aug 11, 2014 at 07:38:50PM -0400, 吴兴博 wrote:
> Hello,
>
> The introduction in the wiki page present several advantages of qcow2
> [1]. But I'm a little confused. I really appreciate if any one can give me
> some help on this :).
>
> (1) Currently the raw format doesn't support COW. In
On Tue, Aug 12, 2014 at 08:07:55AM -0600, Eric Blake wrote:
> On 08/12/2014 07:45 AM, 吴兴博 wrote:
>
> [please don't top-post on technical lists]
>
> > Thanks for your information. It's really helpful.
> > I think adding a bitmap alongside the raw file ( or just within that file)
>
> Umm, how do y
On Tue, Aug 12, 2014 at 11:30 AM, Eric Blake wrote:
> On 08/12/2014 08:14 AM, 吴兴博 wrote:
> >>> However FVD seems to have been ignored by community.
> >>
> >> Care to give a pointer to a URL describing the FVD format?
> >>
> >> http://lists.nongnu.org/archive/html/qemu-devel/2011-01/msg00398.html
On 08/12/2014 08:14 AM, 吴兴博 wrote:
>>> However FVD seems to have been ignored by community.
>>
>> Care to give a pointer to a URL describing the FVD format?
>>
>> http://lists.nongnu.org/archive/html/qemu-devel/2011-01/msg00398.html
>
> This thread could be the clearest message on FVD.
That very
On Tue, Aug 12, 2014 at 10:07 AM, Eric Blake wrote:
> On 08/12/2014 07:45 AM, 吴兴博 wrote:
>
> [please don't top-post on technical lists]
>
> Sorry about that..
> > Thanks for your information. It's really helpful.
> > I think adding a bitmap alongside the raw file ( or just within that
> file)
>
On 08/12/2014 07:45 AM, 吴兴博 wrote:
[please don't top-post on technical lists]
> Thanks for your information. It's really helpful.
> I think adding a bitmap alongside the raw file ( or just within that file)
Umm, how do you propose to add a bitmap within a raw file? The moment
the file contains
Thanks for your information. It's really helpful.
I think adding a bitmap alongside the raw file ( or just within that file)
would be suffice to distinguish between present or in backing file.
The idea in FVD looks similar to 'addcow'---use bitmap but delegating
allocation to FS. However FVD seems
On 08/11/2014 05:38 PM, 吴兴博 wrote:
> Hello,
>
> The introduction in the wiki page present several advantages of qcow2
> [1]. But I'm a little confused. I really appreciate if any one can give me
> some help on this :).
>
> (1) Currently the raw format doesn't support COW. In other words, a raw
On Tue, 12 Aug 2014, Fam Zheng wrote:
> On Mon, 08/11 19:38, 吴兴博 wrote:
> > Hello,
> >
> > The introduction in the wiki page present several advantages of qcow2
> > [1]. But I'm a little confused. I really appreciate if any one can give me
> > some help on this :).
> >
> > (1) Currently the r
On Tue, 08/12 08:03, 吴兴博 wrote:
> I carefully read your reply and thought of it carefully. I'm sorry that
> when I said "I get it" I actually meant "I believe you" but not "I
> understand it".
> The problem would not come from cp or rsync -- It's not their fault. They
> just have no way to make it
I carefully read your reply and thought of it carefully. I'm sorry that
when I said "I get it" I actually meant "I believe you" but not "I
understand it".
The problem would not come from cp or rsync -- It's not their fault. They
just have no way to make it right.
The real reason of it would be that
On Tue, 08/12 06:46, 吴兴博 wrote:
> Hi Fam,
> It's glad to hear you,
> It is said in this post that "All files systems that support inodes
> (ext2/3/4, xfs, btfs, etc) support files with holes while creating the
> files..."
> [
> http://serverfault.com/questions/558761/best-linux-filesystem-for-spa
Hi Fam,
It's glad to hear you,
It is said in this post that "All files systems that support inodes
(ext2/3/4, xfs, btfs, etc) support files with holes while creating the
files..."
[
http://serverfault.com/questions/558761/best-linux-filesystem-for-sparse-files
]
I also heard this claim from othe
On Mon, 08/11 19:38, 吴兴博 wrote:
> Hello,
>
> The introduction in the wiki page present several advantages of qcow2
> [1]. But I'm a little confused. I really appreciate if any one can give me
> some help on this :).
>
> (1) Currently the raw format doesn't support COW. In other words, a raw
>
Hello,
The introduction in the wiki page present several advantages of qcow2
[1]. But I'm a little confused. I really appreciate if any one can give me
some help on this :).
(1) Currently the raw format doesn't support COW. In other words, a raw
image cannot have a backing file. COW depends on
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