Re: [libvirt] changes to domain XML for SCSI support
On 10/26/2011 06:15 PM, Dave Allan wrote:
> In NPIV, a virtual HBA is created using "virsh
nodedev-create" and
> passed to the guest. Such virtual adapter does have a stable
> address, namely its WWN. As such, it can be addressed simply by
> generalizing the kind of source address that can be passed to
> <hostdev type='scsi_host'/>:
>
> <hostdev type='scsi_host'>
> <source>
> <address type='wwn' wwpn='...' wwnn='...'/>
> </source>
> </hostdev>
>
> (Note that this doesn't use<source name='...'/> and, as such,
it
> does not rely on the ideas above).
How do you envision migration working with NPIV?
Perhaps there could be inactive nodedevs (i.e. you would add
define/undefine/start/stop verbs), and a <source name='...'> element
would trigger creation/destruction of those nodedevs around the VM's
lifetime. Then migration would trigger destruction on the source and
creation on the destination. I haven't thought much about it though.
Paolo