On 9/27/2013 at 12:56 AM, in message 5244673f.4000...@redhat.com, Paolo
Bonzini pbonz...@redhat.com wrote:
Il 26/09/2013 12:30, Chunyan Liu ha scritto:
2013/9/26 Paolo Bonzini pbonz...@redhat.com mailto:pbonz...@redhat.com
Il 26/09/2013 09:58, Stefan Hajnoczi ha
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 ordered
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 having
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 to
2013/9/26 Stefan Hajnoczi stefa...@gmail.com
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
2013/9/26 Paolo Bonzini 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, even more when
the
guest in those VM are also using btrfs as file system.
One
Il 26/09/2013 12:30, Chunyan Liu ha scritto:
2013/9/26 Paolo Bonzini pbonz...@redhat.com 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
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
