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admin0 | morning all \o | 08:17 |
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admin0 | anyone here users cache tiering on ceph ? | 11:52 |
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mnaser | admin0 not us but id advise against it | 13:13 |
admin0 | mnaser: please give me reasons that i can take it to managers | 13:14 |
mnaser | (searching that now) | 13:14 |
mnaser | :p | 13:14 |
mnaser | admin0: https://access.redhat.com/documentation/en/red-hat-ceph-storage/2.0/paged/release-notes/chapter-5-deprecated-functionality i think this speaks a lot about it | 13:15 |
mnaser | slight discussion here too http://lists.ceph.com/pipermail/ceph-users-ceph.com/2016-October/013867.html | 13:17 |
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dmsimard | wow, really ? | 13:29 |
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dmsimard | On paper, it allowed for very cost effective setups: spindles with erasure coding for lots of space at a reasonable price and cache tiering on fast SSDs/NVMEs | 13:31 |
mnaser | on paper but there is a lot of troubles with it dmsimard | 13:32 |
mnaser | exactly cache promotion happens per object.. objects in ceph are typically 4MB in size | 13:32 |
dmsimard | I didn't get the chance to go in prod with it, only testing :( | 13:32 |
mnaser | a 1 kb read could technically create a 4MB promotion.. on random read workloads that can really hurt | 13:32 |
dmsimard | I see | 13:33 |
mnaser | (this is out of things that ive read and not personal experience however), but yeah, it sounds like a super good idea imho | 13:33 |
dmsimard | Curious to see where they'll go, they definitely need some sort of system like this | 13:33 |
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admin0 | either people use journing or cache tier, i think migration to bluestore will be happening when its production ready | 13:57 |
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mnaser | thats our plan too admin0 | 14:09 |
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admin0 | have you guys tried migration between two pools ? what is involved .. nova backed by cinder — migration from one pool to another | 14:26 |
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mnaser | admin0 i think nova supports operating with a single pool in the backend | 14:40 |
mnaser | the one defined in nova.conf | 14:40 |
mnaser | you'd be skirting scary waters if you took that path but you could probably do hv by hv | 14:40 |
mnaser | copy the rbd volumes using any other rbd/dd/etc method for a whole hv, restart nova with the new pool | 14:41 |
logan- | yeah you would have to configure it per hv and group them with host aggregates or something. there are several ways you could move the disks between pools in teh ceph backend. using rbd mv is one way. rbd snapshot and flatten is another way, etc | 14:42 |
mnaser | but again, this can be quite dangerous to run two pools | 14:44 |
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mnaser | ex: an offline migration without properly configured schedule will destroy the vm | 14:44 |
mnaser | s/schedule/scheduler/ | 14:44 |
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mgagne | people using Glance policies to restrict image download: http://docs.openstack.org/developer/glance/policies.html#writing-rules | 20:02 |
mgagne | how do you make it so Cinder or Nova can still download the image to boot the instance? The download looks to be done with the customer's token, not Nova service token. | 20:03 |
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mnaser | mgagne doesnt sound possible | 21:23 |
mnaser | however i can imagine you can probably work around it if you use rbd images | 21:24 |
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mgagne | mnaser: or I install a different policy on an internal box :-/ | 21:27 |
mnaser | mgagne yeah running two instances of glance sounds like it would make sense | 21:27 |
mnaser | hassle, but that'll solve it methinks | 21:27 |
mgagne | mnaser: A bit sad since the feature was implemented because of this blueprint: https://blueprints.launchpad.net/glance/+spec/restrict-downloading-images-protected-properties | 21:28 |
mgagne | and then you end up with a non-working feature unless you hack your infra | 21:28 |
mnaser | how did this ever go through lol | 21:29 |
mgagne | ¯\_(ツ)_/¯ | 21:29 |
mnaser | mgagne i think the assumption here is that if a user can build a server from that image, they should be able to download it | 21:30 |
mnaser | which kinda makes sense, because if you're trying to hide the code or some embedded license.. they'd still have access to it | 21:30 |
mgagne | what's the point. Why not using image sharing instead? | 21:30 |
mnaser | mgagne ill speculate that image sharing didnt exist in 2014 when this was implemented :p | 21:30 |
mgagne | image will still show in list, user thinks he can boot from it but can't. | 21:31 |
mgagne | I think it's a half-backed solution if you want my opinion and it expects operators to use a split infra for Glance. One public and one private. | 21:32 |
mgagne | with different policy | 21:32 |
mgagne | unless Nova provides additional info in the request/token that I'm not aware of | 21:32 |
mnaser | if policy.json allows you to check for remote host ip | 21:33 |
mnaser | you can put that in your policy | 21:33 |
mgagne | yea, still waiting for a real answer from #openstack-glance. Maybe I should ask the list instead. | 21:34 |
mnaser | yeah in my experience -glance is pretty quiet | 21:34 |
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