On Tue, Sep 08, 2020 at 08:19:21 -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? I strongly suggest using a virtio-scsi controller and plugging disks into it. You can have a fairly large number of LUNs per controller, so that will severely decrease the amount of required PCI slots. You can obviously add more controllers if you need even more LUNs.
