Thursday, 2016-11-03

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admin0morning all \o08:17
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admin0anyone here users cache tiering on ceph ?11:52
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mnaseradmin0 not us but id advise against it13:13
admin0mnaser: please give me reasons that i can take it to managers13:14
mnaser(searching that now)13:14
mnaser:p13:14
mnaseradmin0: 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 it13:15
mnaserslight discussion here too http://lists.ceph.com/pipermail/ceph-users-ceph.com/2016-October/013867.html13:17
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dmsimardwow, really ?13:29
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dmsimardOn 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/NVMEs13:31
mnaseron paper but there is a lot of troubles with it dmsimard13:32
mnaserexactly cache promotion happens per object.. objects in ceph are typically 4MB in size13:32
dmsimardI didn't get the chance to go in prod with it, only testing :(13:32
mnasera 1 kb read could technically create a 4MB promotion.. on random read workloads that can really hurt13:32
dmsimardI see13:33
mnaser(this is out of things that ive read and not personal experience however), but yeah, it sounds like a super good idea imho13:33
dmsimardCurious to see where they'll go, they definitely need some sort of system like this13:33
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admin0either people use journing or cache tier, i think migration to bluestore will be happening when its production ready13:57
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mnaserthats our plan too admin014:09
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admin0have you guys tried migration between two pools ? what is involved .. nova backed by cinder — migration from one pool to another14:26
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mnaseradmin0 i think nova supports operating with a single pool in the backend14:40
mnaserthe one defined in nova.conf14:40
mnaseryou'd be skirting scary waters if you took that path but you could probably do hv by hv14:40
mnasercopy the rbd volumes using any other rbd/dd/etc method for a whole hv, restart nova with the new pool14:41
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, etc14:42
mnaserbut again, this can be quite dangerous to run two pools14:44
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mnaserex: an offline migration without properly configured schedule will destroy the vm14:44
mnasers/schedule/scheduler/14:44
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mgagnepeople using Glance policies to restrict image download: http://docs.openstack.org/developer/glance/policies.html#writing-rules20:02
mgagnehow 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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mnasermgagne doesnt sound possible21:23
mnaserhowever i can imagine you can probably work around it if you use rbd images21:24
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mgagnemnaser: or I install a different policy on an internal box :-/21:27
mnasermgagne yeah running two instances of glance sounds like it would make sense21:27
mnaserhassle, but that'll solve it methinks21:27
mgagnemnaser: A bit sad since the feature was implemented because of this blueprint: https://blueprints.launchpad.net/glance/+spec/restrict-downloading-images-protected-properties21:28
mgagneand then you end up with a non-working feature unless you hack your infra21:28
mnaserhow did this ever go through lol21:29
mgagne¯\_(ツ)_/¯21:29
mnasermgagne i think the assumption here is that if a user can build a server from that image, they should be able to download it21:30
mnaserwhich kinda makes sense, because if you're trying to hide the code or some embedded license.. they'd still have access to it21:30
mgagnewhat's the point. Why not using image sharing instead?21:30
mnasermgagne ill speculate that image sharing didnt exist in 2014 when this was implemented :p21:30
mgagneimage will still show in list, user thinks he can boot from it but can't.21:31
mgagneI 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
mgagnewith different policy21:32
mgagneunless Nova provides additional info in the request/token that I'm not aware of21:32
mnaserif policy.json allows you to check for remote host ip21:33
mnaseryou can put that in your policy21:33
mgagneyea, still waiting for a real answer from #openstack-glance. Maybe I should ask the list instead.21:34
mnaseryeah in my experience -glance is pretty quiet21:34
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