Re: grid data placement take 2

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On Tue, Feb 19, 2013 at 12:55 PM, Dimitri Maziuk <dmaziuk@xxxxxxxxxxxxx> wrote:
> On 02/19/2013 02:49 PM, Gregory Farnum wrote:
>> On Tue, Feb 19, 2013 at 12:43 PM, Dimitri Maziuk <dmaziuk@xxxxxxxxxxxxx> wrote:
>>> On 02/19/2013 02:39 PM, Sam Lang wrote:
>>>> On Tue, Feb 19, 2013 at 2:31 PM, Dimitri Maziuk <dmaziuk@xxxxxxxxxxxxx> wrote:
>>>>> PPS:
>>>>>
>>>>> on the node that has osd.0:
>>>>> ---------------------------
>>>>>
>>>>> # cephfs /ceph/blastdb set_layout -u 2147483648 -s 2147483648 -c 2147483648
>>>>
>>>> Try 2147483647.
>>>
>>> # cephfs /ceph/blastdb set_layout -u 2147483647 -s 2147483647 -c 2147483647
>>> Error setting layout: Invalid argument
>>
>> cephfs has a crappy interface, (which will shortly be obsoleted thanks
>> to the new "virtual xattrs" which expose the layout stuff through
>> xattrs). You need to specify the pool ID as well. :(
>
> Thanks but no, that's not it and besides it worked with 2147483648.
> Looks like it's because it's not a multiple of some power of 2.

Sorry, I hadn't read the whole story, just saw that last message. I'm
not sure where it's coming from exactly, but honestly I wouldn't
recommend running with objects that large. I'd expect you to see
better performance (even over the network) with a bit more of a
distribution.
-Greg
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