[Nexus] Split datasets?

[Benjamin Watts]

Hi Carlos,
    This is probably what I was thinking about - thanks! The answer from 
Mark about using the areaDetector drivers looks like it would be the 
best solution to the problem, if it works properly - thanks to you too, 
Mark!

Cheers,
Ben


On 04/09/2019 09:10 AM, Carlos Pascual wrote:
> Hi,
> Don't HDF5 "virtual datasets" help you with this?
>
> https://support.hdfgroup.org/HDF5/docNewFeatures/
> NewFeaturesVirtualDatasetDocs.html
>
> http://docs.h5py.org/en/stable/vds.html
>
> They are an HDF5 thing, but I guess they are transparent for nexus.
>
> (sorry if I totally missed the point)
>
> Carlos
>
>
> On Monday, April 8, 2019 7:41:46 PM CEST Benjamin Watts wrote:
>> Hi Everyone,
>>      One of our beamlines wants to write write data into a
>> Nexus-compatible file. The problem is that the hardware/software
>> combination is a bit strange and wants to write the data in pieces. This
>> is an XRF detector used in a scanning experiment such that a spectrum is
>> recorded for each step along the scan. The detector wants to fill up its
>> buffer with scans and then dump them into an HDF5 dataset. If it would
>> just append to a single dataset then it would be fine, but no that
>> doesn't seem to work. Do we have a scheme in NeXus for describing how a
>> set of datasets should be appended together when reading? I feel like we
>> discussed a similar issue previously with a very fast 2D detector that
>> would write data in sets of ~100 frames into separate files that would
>> be linked to by a master file. I haven't been able to find anything on
>> the topic - does anyone else remember further details?
>>
>> Thanks,
>> Ben
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>