Thank you, Sebastien Han. I am sure many are thankful you've published your thoughts and experiences with Ceph and even OpemStack. If I may, I would like to reword my question/statement with greater clarity: To force all instances to always boot from RBD volumes, would a person would have to make changes to something more than Horizon (demonstration GUI)? If the changes need only be in Horizon, the provider would then likely need to restrict or deny their customers access to their unmodified APIs. If they do not, then the unchanged APIs would allow for behavior the provider does not want. This is correct. Forcing the boot from volume requires a modified version of the API which kinda tricky and GUI modifications. There are 2 cases: 1. you're an ISP (public provider), you should forget about the idea unless you want to provide a _really_ close service. 2. you're the only one managing your platform (private cloud) this might be doable but even so you'll encounter a lot of problems while upgrading. At the end it's up to you, if you're 100% sure that you have the complete control of your infra and that you know when, who and how new instances are booted (and occasionally don't care about update and compatibility). You can always hack the dashboard but it's more than that you have to automate the action that each time someone is booting a VM you have to create a volume from an image for this. This will prolong the process. At this point, I'll recommend you to push this blueprint, it'll run all the VM through ceph even the one not using the boot-from-volume option. https://blueprints.launchpad.net/nova/+spec/bring-rbd-support-libvirt-images-type An article is coming next week and will cover the entire subject. Cheers! –––– Sébastien Han Cloud Engineer "Always give 100%. Unless you're giving blood."  Phone : +33 (0)1 49 70 99 72 – Mobile : +33 (0)6 52 84 44 70 Email : sebastien.han@xxxxxxxxxxxx – Skype : han.sbastien Address : 10, rue de la Victoire – 75009 Paris Web : www.enovance.com – Twitter : @enovance
On Jun 17, 2013, at 8:00 AM, Wolfgang Hennerbichler <wolfgang.hennerbichler@xxxxxxxxxxxxxxxx> wrote:
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