RLS and DRS Roadmap Items Ann Chervenak Robert Schuler USC Information Sciences Institute

Replication Services l Replica Location Service (RLS) u Maintains mappings between logical file names and physical locations u Associates attributes with mappings l Data Replication Service (DRS) u Combines RLS cataloguing with data replication operations performed by Reliable File Transfer Service (RFT)

RLS Roadmap: Pluggable RLS Backend l Current RLS backend is some type of relational database u Good performance and scalability l Want to be able to support a backend mechanism for storing name mappings that is optimized to provide higher performance l Requestor: LIGO l Pluggable backend to allow use of a specialized hashing technique

RLS Roadmap (Requested): Improved Support for Bulk Renames l SCEC project adding and updating hundreds of thousands of entries l Would like better support for bulk modification command u E.g., regular expression-based replacement of filename prefixes

DRS Roadmap: Requirements analysis and improvements to DRS in support of LIGO l Design of DRS is based on LIGO's Lightweight Data Replicator service l Explore requirements for integrating DRS into the next generation of LIGO data architecture l Identify and implement enhancements to DRS to support the requirements of high-performance data Grids

DRS Roadmap: Replica Validation Capability l Design and implement replica validation and consistency checking l Requested by LIGO and others l Current DRS supports on-demand replication of data files between sites u Once data has been replicated, there is no guarantee that replica consistency will be maintained l Users need the ability to validate replicated data files and identify files that do not meet a specified equivalence criterion