[NeXus-committee] Next DECTRIS Summary

[Mark Koennecke]

\
Peter,

On 01/17/2013 05:23 PM, Peterson, Peter F. wrote:
> We (read: SNS) is currently dividing our (raw) data into separate 'banks'
> to make chopping up large runs easier. We do have matching
> /NXentry/NXinstrument/NXdetector for each /Nxentry/NXdata. Will this no
> longer be considered proper NeXus?
I consider this still good NeXus. The trouble is that with DECTRIS we 
need to compromise
in order to cover a variety of problems:
* The lack of parallel compressed writing in HDF-5
* The slow compression algorithm in HDF-5
* There is a demand to start DA during DAQ. The Dectris scheme allows 
this. HDF-5 not really,
    they are implementing SWMR now, Multi Writer, Multi Reader, MWMR, is 
not even being
    considered.
* The need to write large amounts of data quickly. Their detector 
delivers 5GB/sec. A value we neutron
    people can only dream of. Even at SNS or ESS.
* The impossibility for Dectris to ask their customers to provide proper 
HW, like a parallel FS etc. They
    can only control the computers they deliver with the detector.

Regards,

             Mark
> I haven't been following this conversation very closely so sorry if this
> has already been covered.
>
> P^2
>
> On 1/17/13 8:49 AM, "Mark Koennecke"<Mark.Koennecke at psi.ch>  wrote:
>
>> Hi,
>>
> >from the discussion in the mailing list it appears to me that there are
>> two things:
>>
>> - DECTRIS gets told that we want all the linked data in
>> entry:NXentry/data:NXdata.
>>    No separate NXdata groups for separate linked data segments.
>> - Internally we need to discuss how to properly annotate segmented data.
>> A topic for
>>    the next Telco?
>>
>> If you disagree with my summary of the discussion please  speak up.
>>
>> Best Regards,
>>
>>                Mark
>>
>>
>>
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