Re: Re: [virtio-comment] About adding a new device type virtio-nvme

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Jan 17, 2023 at 11:01:37AM -0500, Stefan Hajnoczi wrote:
> > The NVME technology and ecosystem are complete. However, in virtualization scenarios, NVME devices can only use PCIe pass-through . When NVME and virtio combine to connect to the vDPA ecosystem, live migration is supported.
> > 
> > 
> > >Let's not forget that virtio-blk is widely used and new commands are
> > >being added as needed. Which NVMe features are you missing in
> > >virtio-blk?
> > 
> > With the introduction of the concept of DPU, a large number of vendors are offloading virtual devices to hardware. The back-end of Virtio-blk does not support remote storage. Therefore, Virtio-Nvme-of can well combine the advantages of remote storage and virtio live migration
> 
> virtio-blk is just a storage interface, whether that storage is local or
> remote is up to the device implementation. The block device could be
> located on Ceph, NFS, etc.
> 
> Each virtio-blk device is a single block device. There is no
> standardized management protocol in virtio-blk for connecting to remote
> block devices. I'm aware of hardware virtio-blk devices that connect to
> remote storage. Configuration is performed through an out-of-band
> management interface.
> 
> Maybe when you say virtio-blk doesn't support remote storage this is
> what you mean?
> 
> Stefan

侯英乐 you never answered this question.

-- 
MST


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