Brilliant, thanks! That'll do for now. Not something we can do real time given the speed, but certainly enough to get by on for generating reports.
Cheers, On 17 October 2013 08:41, Josh Durgin <josh.dur...@inktank.com> wrote: > On 10/15/2013 08:56 PM, Blair Bethwaite wrote: > >> >> > Date: Wed, 16 Oct 2013 16:06:49 +1300 >> > From: Mark Kirkwood <mark.kirkw...@catalyst.net.nz >> <mailto:mark.kirkwood@**catalyst.net.nz <mark.kirkw...@catalyst.net.nz>>> >> > To: Wido den Hollander <w...@42on.com <mailto:w...@42on.com>>, >> ceph-users@lists.ceph.com >> <mailto:ceph-us...@lists.ceph.**com<ceph-users@lists.ceph.com> >> > >> >> > Subject: Re: [ceph-users] Is there a way to query RBD usage >> > Message-ID: >> <525E02C9.9050904@catalyst.**net.nz<525e02c9.9050...@catalyst.net.nz> >> <mailto:525E02C9.9050904@**catalyst.net.nz<525e02c9.9050...@catalyst.net.nz> >> >> >> >> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed >> > >> > On 16/10/13 15:53, Wido den Hollander wrote: >> > > On 10/16/2013 03:15 AM, Blair Bethwaite wrote: >> > >> I.e., can we see what the actual allocated/touched size of an RBD >> is in >> > >> relation to its provisioned size? >> > >> >> > > >> > > No, not an easy way. The only way would be to probe which RADOS >> > > objects exist, but that's a heavy operation you don't want to do with >> > > large images or with a large number of RBD images. >> > > >> > >> > So maybe a 'df' arg for rbd would be a nice addition to blueprints? >> >> Yes, I think so. It does seem a little conflicting to promote Ceph as >> doing thin-provisioned volumes, but then not actually be able to >> interrogate their real usage against the provisioned size. As a cloud >> admin using Ceph as my block-storage layer I really want to be able to >> look at several metrics in relation to volumes and tenants: >> total GB quota, GB provisioned (i.e., total size of volumes&snaps), GB >> allocated >> When users come crying for more quota I need to whether they're making >> efficient use of what they've got. >> >> This actually leads into more of a conversation around the quota model >> of dishing out storage. IMHO it would be much more preferable to do >> things in a more EBS oriented fashion, where we're able to see actual >> usage in the backend. Especially true with snapshots - users are >> typically dismayed that their snapshots count towards their quota for >> the full size of the originally provisioned volume (despite the fact the >> snapshot could usually be truncated/shrunk by a factor of two or more). >> > > You can see the space written in the image and between snapshots (not > including fs overhead on the osds) since cuttlefish: > > http://permalink.gmane.org/**gmane.comp.file-systems.ceph.**user/3684<http://permalink.gmane.org/gmane.comp.file-systems.ceph.user/3684> > > It'd be nice to wrap that in a df or similar command though. > > -- Cheers, ~Blairo
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