On Tue, Sep 8, 2020 at 8:43 AM Daniel P. Berrangé <berra...@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 > -- > |: https://berrange.com -o- > https://www.flickr.com/photos/dberrange :| > |: https://libvirt.org -o- > https://fstop138.berrange.com :| > |: https://entangle-photo.org -o- > https://www.instagram.com/dberrange :| > >