Data Breakout

OGSA Architecture – databases Eldas, OGSA-DAI and GridMiner implement a slightly old version of OGSA / DAIS –Architecture doc describes capabilities; DAIS explores details Current OGSA / DAIS spec does not include: –Extensibility (e.g. as used in e-Diamond) –Packing of multiple tasks and multiple data sets –Translation Definitely need (* as noted in OGSA doc): –Data connection / third-party delivery* –Unique names for identifying data content and data instance* –Robust and integrated architecture* –Model of metadata for databases Eldas and OGSA-DAI have OGSI, WSRF and WS-I interfaces planned –OGSA explicitly assumes WSRF –Some resistance to this; a federated approach suggested

OGSA Architecture – Files File Storage – GSM (SRM-like) Directory structure – GFS Replica Catalogs – OREP Metadata Catalogs –File stats (locking, mutability, ACLs) –User attributes API for access – ADF (POSIX-like) Definitely need: –Naming –Data Movement

Web Service Interfaces SRM is not WS-I compliant (yet) Eldas supports message-level encryption – https for Wed Services – WS-Security for Grid services OGSA-DAI requires XSLT Other standards that we have to adhere to –POSIX, Windows, NFS, FTP, Gzip, …

APIs: User commands Files: Explorer equivalent –Including ls, tail, find, … ? Need to prioritise –Quota management –ACLs Files: Directories –Familiar interface Databases: Query tool –OGSA-DAI and Eldas provide GUI tools –Quick query, schema inspection, etc –No existing standard Databases: DBA Tools –No existing standard

APIs: programming interfaces Files: SRM –POSIX-like Need to prioritise –plus management interface to handle scalable systems Files: Directories –Familiar interface Files: Catalogs –One-shot interface (because content unknown) –Bulk operations Databases: –“OGSA-DAI client API” E.g. simple query Add to SAGA or form DAIS API group? –Extensibility interface (client and server) –Bulk operation and bulk data interface (client and server)