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<font face="Times New Roman">Dear all,<br>
<br>
This message if for those responsible for CMIP5 data.<br>
<br>
We are attempting to replicate at PCMDI and other major data
archives a considerable fraction of the model output you have made
available to CMIP5 scientists. To assure only genuine replicas
are served, we want to verify that the checksums are the same at
all sites. I am therefore writing to request with some urgency
that you publish checksums. For datasets that you have already
published, you can add the checksum following the instructions
found at:<br>
<br>
<a class="moz-txt-link-freetext"
href="http://www2-pcmdi.llnl.gov/Members/bdrach/.personal/esg-publication-scripts#publishing-checksums-and-other">http://www2-pcmdi.llnl.gov/Members/bdrach/.personal/esg-publication-scripts#publishing-checksums-and-other</a><br>
<br>
Note that you should make sure you have the latest version of the
publisher. (We had to add new capability to the publisher for
this purpose.) You will have already created mapfiles before, so
it should not be difficult to simply add the checksum information
you need.<br>
<br>
By the way, if you plan to newly publish additional datasets,
there is an option to create the checksums during the initial
publication of the data, but that will, of course, slow down the
publication script substantially. If you elect to publish new
datasets initially without checksums, please add checksums within
a few days.<br>
<br>
Not only will the checksums help us in replicating data (which
will provide better access to the users), certain heavy users of
CMIP5 data have been urging us to provide this information for
some time now. We thank you for your hard work in improving CMIP5
data services.<br>
<br>
On another matter, a reminder: If you in any way modify a netCDF
file that has been published to ESG, please make sure that the
"tracking_id" (one of the netCDF global attributes) in the file is
also modified before it is republished.<br>
<br>
thanks and best regards,<br>
Karl<br>
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