In progress - starting with ATLAS requirements. Other experiments / storage systems should add material. See also pre-GDB talks for information that could be used to fill these tables

Current data access features required by WLCG experiments and the protocols used to provide

Feature ATLAS
  Current Proposed
Transfer and data access    
Upload a complete file (From WN -> Storage) SRM +gridFTP/Xrootd gridFTP, xrootd
Download complete file (From Storage -> WN or user machine) ZOO (rfio, dcap,http, xrootd, gridFTP, SRM) Xrootd, file, gridFTP, http
Direct access of file (From Storage on WN) Dcap,xrootd, file, rfio Xrootd, File, (maybe http (davix))
Manage third-party copy (FTS) SRM + gridFTP gridFTP-only
Namespace Interaction    
Upload and check data integrity information (chksums) gridFTP / xrootd (some servers) gridFTP / xrootd/http (gfal2)
Deleting data and directories SRM WebDav
Changing ownership, perms and ACLs SRM (Or admin) Site Admin?
Storage Capacity Management    
Query used capacity (like df) SRM WebDav or JSON file
Targeting uploads to specific reservation SRM Just namespace

Support for Protocols by Storage Systems in use by WLCG

Guidance (links and resources) for sites wanting to deploy storage for WLCG experiments or change from one protocol to another

-- WahidBhimji - 2015-01-21
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Topic revision: r2 - 2015-03-18 - WahidBhimji
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