Le Friday 03 Aug 2012 à 16:14:51 (+), Blue Swirl a écrit :
> On Thu, Aug 2, 2012 at 10:16 AM, Benoît Canet wrote:
> > This patchset create a block driver implementing a qorum using three qemu
> > disk
> > images. Writes are mirrored on the three files.
> > For the reading part the three files
On Thu, Aug 2, 2012 at 10:16 AM, Benoît Canet wrote:
> This patchset create a block driver implementing a qorum using three qemu disk
> images. Writes are mirrored on the three files.
> For the reading part the three files are read at the same time and a vote is
> done to determine which is the ma
On Thu, Aug 2, 2012 at 8:22 PM, Benoît Canet wrote:
>> I'm not entirely sure I understand the use-case all that well.
>>
>> Wouldn't the more typical approach be RAID-5 and the use of parity
>> instead of relying on voting?
>>
>> Quorum doesn't work well with an odd number of disks whereas RAID-5
> I'm not entirely sure I understand the use-case all that well.
>
> Wouldn't the more typical approach be RAID-5 and the use of parity
> instead of relying on voting?
>
> Quorum doesn't work well with an odd number of disks whereas RAID-5
> does. You also get significantly more usable disk spac
Benoît Canet writes:
> This patchset create a block driver implementing a qorum using three qemu disk
> images. Writes are mirrored on the three files.
> For the reading part the three files are read at the same time and a vote is
> done to determine which is the majoritary qiov version. It then
Le Thursday 02 Aug 2012 à 07:17:35 (-0600), Eric Blake a écrit :
> How does this fit with snapshots? Does a snapshot of a quorum require
> passing in three filenames, one for each of the three sources?
For now quorum lives on top of qcow*/qed it doesn't fit well with snapshot:
it a step before tu
On 08/02/2012 04:16 AM, Benoît Canet wrote:
> This patchset create a block driver implementing a qorum using three qemu disk
s/qorum/quorum/g throughout the series, including subject line
> images. Writes are mirrored on the three files.
> For the reading part the three files are read at the same
This patchset create a block driver implementing a qorum using three qemu disk
images. Writes are mirrored on the three files.
For the reading part the three files are read at the same time and a vote is
done to determine which is the majoritary qiov version. It then return this
majoritary version
