large number of hot plug disks

Daniel P. Berrangé berrange at
Tue Sep 8 12:43:37 UTC 2020

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 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

These blog posts should serve as warning about some of the limits
you'll hit:

|:      -o- :|
|:         -o-   :|
|:    -o- :|

More information about the libvir-list mailing list