large number of hot plug disks

[Alexander Wels]

On Tue, Sep 8, 2020 at 8:43 AM Daniel P. Berrangé <berrange at redhat.com>
wrote:

> On Tue, Sep 08, 2020 at 08:19:21AM -0400, Alexander Wels wrote:
> > Hi,
> >
> > I am working on a project, and one of the requirements is that I can
> > hotplug a large number of disks. Think several dozens to potentially
> 100+.
> > The guest OS will be some linux flavor so it should have no problem with
> a
> > large number of disks.
> >
> > During my experimentation I quickly ran into the "No available PCI slots"
> > limit. I found https://libvirt.org/pci-hotplug.html explaining to me why
> > the limit is there. Now I could add a bunch of pcie-root-ports ahead of
> > time, but there is likely a limit to that as well. So before I go down
> some
> > crazy paths, I figured I would ask on here if there is a better plan than
> > adding a bunch of root ports for adding a large number of hotplugged
> disks?
>
> While you can add extra PCI bridges, I'd suggest using virtio-scsi
> instead
>
> These blog posts should serve as warning about some of the limits
> you'll hit:
>
>
> https://rwmj.wordpress.com/2017/04/25/how-many-disks-can-you-add-to-a-virtual-linux-machine/
>
> https://rwmj.wordpress.com/2017/04/28/how-many-disks-can-you-add-to-a-virtual-linux-machine-contd/
>
>
Thanks I read those. my absolute upper limit is going to be in the 100ish
range so I should be good there. I will investigate virtio-scsi.


> Regards,
> Daniel
> --
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