Martin Fick wrote: > Hello, > > I have a questions with respect to RADOS and RBD and the cluster monitor > daemons. I'm not one of the developers, but I've been following for a while and one of your sub-questions intriqued me; specifically: >...This would open up the use of RBD devices for linux > containers or linux vservers which could run on any machine in a cluster > (similar to the idea of using it with kvm/qemu). As it currently stands you could likely run a vserver or an OpenVZ/Virtuozzo/LXC container on Ceph (the distributed FS) directly, rather than layering a local FS over RBD. Also, this would probably provide better performance in the end. As a side benefit, you would gain the ability to make fine-grained snapshots of the guests' filesystems, access them directly from the host (or another Ceph client), and adjust quotas for the guest while running. This is probably a better solution for container-based virtualization than RBD-based options, due to the advantage one can take of all guests sharing a kernel with the host. RBD is more likely to be useful for full virtualization like KVM, but even in that case you could probably make a specialized initramfs that mounts a rootfs over Ceph with a prefix (taking advantage of that Ceph allows mounting a subdirectory as if it was the whole FS). Hope this helps! -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
