Il 27/09/2013 10:58, Chun Yan Liu ha scritto:
>> If so, you could run QEMU with "cache=unsafe" and have
>> basically the same data safety guarantees as "cache=writeback" on
>> every other file system.
> "cache=unsafe" means it never calls fsync() ?
Yes. However, metadata writes are still done and
>>> On 9/27/2013 at 12:56 AM, in message <5244673f.4000...@redhat.com>, Paolo
Bonzini wrote:
> Il 26/09/2013 12:30, Chunyan Liu ha scritto:
> >
> >
> >
> > 2013/9/26 Paolo Bonzini mailto:pbonz...@redhat.com>>
> >
> > Il 26/09/2013 09:58, Stefan Hajnoczi ha scritto:
> > > On W
Il 26/09/2013 12:30, Chunyan Liu ha scritto:
>
>
>
> 2013/9/26 Paolo Bonzini mailto:pbonz...@redhat.com>>
>
> Il 26/09/2013 09:58, Stefan Hajnoczi ha scritto:
> > On Wed, Sep 25, 2013 at 02:38:36PM +0800, Chunyan Liu wrote:
> >> Btrfs has terrible performance when hosting VM images,
2013/9/26 Paolo Bonzini
> Il 26/09/2013 09:58, Stefan Hajnoczi ha scritto:
> > On Wed, Sep 25, 2013 at 02:38:36PM +0800, Chunyan Liu wrote:
> >> Btrfs has terrible performance when hosting VM images, even more when
> the
> >> guest in those VM are also using btrfs as file system.
> >> One way to
2013/9/26 Stefan Hajnoczi
> On Wed, Sep 25, 2013 at 02:38:36PM +0800, Chunyan Liu wrote:
> > Btrfs has terrible performance when hosting VM images, even more when the
> > guest in those VM are also using btrfs as file system.
> > One way to mitigate this bad performance would be to turn off COW
>
Il 26/09/2013 09:58, Stefan Hajnoczi ha scritto:
> On Wed, Sep 25, 2013 at 02:38:36PM +0800, Chunyan Liu wrote:
>> Btrfs has terrible performance when hosting VM images, even more when the
>> guest in those VM are also using btrfs as file system.
>> One way to mitigate this bad performance would be
On Wed, Sep 25, 2013 at 02:38:36PM +0800, Chunyan Liu wrote:
> Btrfs has terrible performance when hosting VM images, even more when the
> guest in those VM are also using btrfs as file system.
> One way to mitigate this bad performance would be to turn off COW
> attributes on VM files (since havin
Hi, List,
Btrfs has terrible performance when hosting VM images, even more when the
guest in those VM are also using btrfs as file system.
One way to mitigate this bad performance would be to turn off COW
attributes on VM files (since having copy on write for this kind of data is
not useful). We c
