Speaker
Maarten Litmaath
(CERN)
Description
SRM v2.1 features and status
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Version 2.1 of the Storage Resource Manager interface offers various
features that are desired by EGEE VOs, particularly HEP experiments:
pinning and unpinning of files, relative paths, (VOMS) ACL support,
directory operations, global space reservation. The features are
described in the context of actual use cases and availability in the
following widely used SRM implementations: CASTOR, dCache, DPM.
The interoperability of the different implementations and SRM versions
is discussed, along with the absence of desirable features like quotas.
Version 1.1 of the SRM standard is in widespread use, but has various
deficiencies that are addressed to a certain extent by version 2.1.
The two versions are incompatible, necessitating clients and servers
to maintain both interfaces, at least for a while. Certain problems
will only be dealt with in version 3, whose definition may not be
completed for many months. There are various implementations of
versions 1 and 2, developed by different collaborations for different
user communities and service providers, with different requirements
and priorities. In general a VO will have inhomogeneous storage
resources, but a common SRM standard should make them compatible,
such that data management tools and procedures need not bother with
the actual types of the storage facilities.
Author
Maarten Litmaath
(CERN)
