Hello Robin, On 6/3/14, 24:40 AM, Robin H. Johnson wrote: > On Mon, Jun 02, 2014 at 09:32:19PM +0300, Filippos Giannakos wrote: >> As you may already know, we have been using Ceph for quite some time now to back >> the ~okeanos [1] public cloud service, which is powered by Synnefo [2]. > (Background info for other readers: Synnefo is a cloud layer on top of > Ganeti). > >> In the article we describe our storage needs, how we use Ceph and how it has >> worked so far. I hope you enjoy reading it. > Are you just using the existing kernel RBD mapping for Ganeti running > KVM, or did you implement the pieces for Ganeti to use the QEMU > userspace RBD driver? Non of the above. From the Ceph project we are just using RADOS, which we access via an Archipelago [1] backend driver that uses librados from userspace. We integrate Archipelago with Ganeti with the Archipelago ExtStorage provider. > I've got both Ceph & Ganeti clusters already, but am reluctant to marry > the two sets of functionality because the kernel RBD driver still seemed > to perform so much worse than the Qemu userspace RBD driver, and Ganeti > still hasn't implemented the userspace mapping pieces :-( > Ganeti supports accessing RADOS from userspace (via the qemu-rbd driver) since version 2.10. The current stable is 2.11. Not only that, but starting v2.13 (not released yet), you will be able to configure the access method per-disk, e.g. saying that the first disk of the instance will be kernel backed and the second userspace backed. So, I'd suggest you give it a try and see how it goes :) Thanks, Constantinos [1] https://www.synnefo.org/docs/archipelago/latest/ -- 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
