[nova] iothread support with Libvirt

Laurent Dumont laurentfdumont at gmail.com
Fri Jan 7 00:09:14 UTC 2022

For sure!  I would be curious to see the benchmarks. I haven't deployed
anything with LVM but I'm surprised that the cost is so high.

There is a pretty thin line between the VM --> Libvirt --> Qemu --> LVM. I
would expect the performance to be close to baremetal, but lower of course.

On Thu, Jan 6, 2022 at 6:51 PM Eric K. Miller <emiller at genesishosting.com>

> > Out of curiosity, how are you passing the local storage to the VM? I
> would also assume a performance hit when using a VM but local storage
> (instead of Ceph, iscsi, nfs) should still perform well?
> We're using and LVM logical volume on 4 x Micron 9300's in a RAID 0
> configuration using md.  We're using the standard Nova "image_type=lvm"
> option.
> The performance is good, relative to something as slow as Ceph, but the
> performance hit is pretty significant compared to the host's performance.
> It is essentially IOPS limited.  I can run some tests and provide results
> if you were interested.
> Eric
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