Re: [libvirt] New QEMU daemon for persistent reservations
On Fri, Nov 24, 2017 at 15:38:54 +0100, Michal Privoznik wrote:
On 08/22/2017 06:27 PM, Paolo Bonzini wrote:
> Hi all,
>
Sorry for resurrecting old thread but seems like there was no agreement
reached.
We don't want to expose any paths because the fact that PR helper is a
separate binary that uses a UNIX socket to talk to qemu is a
implementation detail of qemu. Other HVs may have it differently.
However, we want to be able to turn it on/off or not mention it at all
on per-disk basis. So what has been suggested so far is:
<disk type='block' device='disk'>
<source dev='/dev/sda'>
<target dev='sda' bus='scsi'/>
<reservations enable='yes'/>
</disk>
Note that if the reservation is applied to the image and not the disk
the element should become child of the <source> elememt. Especially if
there is only a ever so slight chance that it will work with formats
supporting backing store (qcow2) and thus there would be a need to
configure it per-image.
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