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| supamatt | DHE: Are you planning to use RBD pools with NOVA? | 15:06 |
|---|---|---|
| DHE | supamatt: that is the plan. I'm actually migrating away from a drbd-based system due to drbd being crap | 15:06 |
| supamatt | DHE: If so, you'll want your images set as RAW. So that Ceph can simply take a snapshot of that volume during the creation of your image. | 15:06 |
| supamatt | DHE: there wouldn't be a need to copy it out via Glance if you do it that way. | 15:07 |
| supamatt | *during the creation of your instance* sorry | 15:07 |
| DHE | supamatt: yeah I've seen that, but I do have an existing glance system and I don't mind waiting for the copy/convert step | 15:07 |
| DHE | maybe I'll change my mind at a later date. right now I'm in a rush to burn drbd to the ground | 15:07 |
| supamatt | That is on what today? | 15:07 |
| DHE | right now I'm on drbdmanage with diskless clients, and a custom ZFS+iSCSI driver for not-quite-so-redundant VMs | 15:08 |
| supamatt | Well I don't understand why you would be using krbd in the first place. | 15:09 |
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| supamatt | All of the openstack components including Glance will use librbd, which is the userspace implementation for communicating with Ceph. | 15:09 |
| DHE | that was my question really. the conversion starts tomorrow and I'm still making some decisions about how I'm going to execute it. | 15:10 |
| supamatt | Well, you'll want to evacuate a compute node. Change it to use RBD with Nova, then recreate your instances on that compute node. | 15:10 |
| supamatt | That's the only way to do that. | 15:12 |
| DHE | there's no option to maintain the same instance but switch out the boot volume? | 15:12 |
| DHE | I mean obviously theres going to be some extended downtime... | 15:12 |
| supamatt | Not really, no. | 15:13 |
| supamatt | Every instance will need to have a snapshot taken, then you'll want to redeploy that instance on Ceph by recreating it from that snapshot. | 15:13 |
| DHE | disappointing, but I can make it work... | 15:18 |
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