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List:       ceph-devel
Subject:    Re: location-aware file placement in Ceph
From:       Gregory Farnum <greg () inktank ! com>
Date:       2014-02-27 18:29:58
Message-ID: CAPYLRzjxhFkETj7ijQXHSjyKBP9LXcuxSqJdSA98KFBrYVVAUQ () mail ! gmail ! com
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There are some options within CRUSH to let you decide where you want
to place particular classes of data, but it's not really available on
a per-object or per-file basis. You should look through the CRUSH
stuff at ceph.com/docs to get an idea of what's possible.
-Greg
Software Engineer #42 @ http://inktank.com | http://ceph.com


On Thu, Feb 27, 2014 at 5:25 AM, Zhongliang Zhao
<zhaozhongliang@gmail.com> wrote:
> Dear all,
>
> As new to ceph, may I ask in the crush algorithm, is there a way to
> configure where the file to be stored, not randomly.
> My requirement is to place the files that within the same location(within a
> geographic area), into the same OSD, instead of randomly placing them
> seperately.
>
> I guess crush may support this. But to do this, I just have to configure
> some parameters in some ceph commands? or I have to modify the ceph crush
> algorithm and re-compile ceph?
>
> Many thanks for any helpful pointers.
>
> Cheers, Giovanni
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