Re: grid data placement take 2

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On Sat, Feb 16, 2013 at 11:24 AM, Dimitri Maziuk <dmaziuk@xxxxxxxxxxxxx> wrote:
> On 2/16/2013 11:04 AM, Sam Lang wrote:
>
>> You can, but ceph always performs reads from the primary osd, so you
>> will still need to use the set_layout and map commands mentioned above
>> to run your jobs on the right nodes.
>
>
> Do I need to run them on every cephfs client? Or is it enough to set the
> layout once -- on the host that has cephfs mounted read-write (and hosts
> osd.0)?

Once in enough for set_layout.  You can set it on the parent directory
and all files will inherit that layout.  For the map command, you
would run it before each job to determine the best location to run the
job.
-sam

>
> Thx
> Dima
>
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