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| − | PAGE VERY MUCH IN PROGRESS
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| − | == Technical overview ==
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| − | The SweStore National Storage infrastructure is implemented using the
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| − | distributed storage solution [http://www.dcache.org dCache].
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| − | The core services of the system is located at HPC2N at Umeå
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| − | University. There are over 65 (in Nov 2011) online storage pools
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| − | attached to the system and they are located at Lunarc, C3SE, NSC, PDC,
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| − | Uppmax and HPC2N. A file upload usually go directly from the source to
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| − | one of the storage pools without going through the core service which
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| − | gives a high aggregated transfer performance for the system. All files
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| − | in the SNIC part of storage are replicated on a different site for
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| − | availability reasons. Unless the core services are unreachable, an
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| − | entire site can be offline without any loss of functionality for
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| − | SweStore.
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| − | There are several access protocols for SweStore National Storage. The
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| − | primary ones being the SRM and WebDAV.
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| − | SweStore currently uses certificates for authentication. Please see,
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| − | [[Grid certificates]], for information on how to get and manage | |
| − | certificates.
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| − | There are no backups of data on SweStore. The files are replicated to
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| − | minimize the risk of data loss due to hardware problems. But if the
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| − | end user deletes a file it will be lost.
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| − | There are currently no tape backend attached to SweStore, but that may
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| − | be changed in the future. The tape would be used for archiving data
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| − | that hasn't been accessed for a long time.
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| − | One very nice aspect of SweStore access is that staging data in and
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| − | out from grid clusters with ARC works really nice. Instead of copying
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| − | data to the clusters and then copying the results out again you can
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| − | let ARC do that for you. Just specify the input file URL:s you need
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| − | and let ARC do the work for you.
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