Re: large number of hot plug disks

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-vir... https://rwmj.wordpress.com/2017/04/28/how-many-disks-can-you-add-to-a-vir...

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 :|