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FTS & SRM

FTS & SRM. j.jensen@rl.ac.uk hepsysman Oxford 5 Dec 2005. What is FTS. EGEE JRA1 File Transfer Service Reliable file transfer Manages talking to Storage Elements (via SRM interface) Manages GridFTP (third party) data transfers between SEs Restarts in case of failure.

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FTS & SRM

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  1. FTS & SRM j.jensen@rl.ac.uk hepsysman Oxford 5 Dec 2005 Storage Middleware

  2. What is FTS • EGEE JRA1 File Transfer Service • Reliable file transfer • Manages talking to Storage Elements (via SRM interface) • Manages GridFTP (third party) data transfers between SEs • Restarts in case of failure Storage Middleware

  3. Confusingly(?) many names for files: LFN: Logical File Name GUID: used by RM SFN: Site filename née PFN – “physical” SURL: SFN as URL StFN: Storage file name TURL: Transfer URL Catalogues and Names and Stuff User LFN Replica catalogue Replica manager SURL GUID SFN SE disk cache Storage Element Mass Storage TURL StFN Storage Middleware

  4. Why FTS • Many SRM 2.1 implementations are new • Interoperability problems expected • Not all sites will upgrade from 1.1 at same time • In the interim phase, FTS can speak to all flavours of SRM • Until all SRMs have 2.1 interface and can interoperate • Uses put/get between SRMs Storage Middleware

  5. Plans for FTS • Support for SRM 2.1 “by end of 2005” • According to Peter Kunszt • However, plan says not till version 1.6? • Will speak to all SRMs • Am I speaking to 1.1 or 2.1.1-something? • Use service discovery • Try – and be resilient to failure • Fetch SRM metadata Storage Middleware

  6. Plans for FTS • FTS will not use advanced features • At least in near future (<= EGEE_1) • Pinning, space reservation Storage Middleware

  7. Goals for FTS • See later talk for SC4 goals • Read about Chris’ experiences: http://wiki.gridpp.ac.uk/wiki/RALPP_Local_SC4_Preparations • And the FTS pages in the Wiki • http://wiki.gridpp.ac.uk/wiki/FTS • phedex will (can?) move files via FTS Storage Middleware

  8. Issues • Abysmal performance FTSing files out of dCache  • OK with DPM  • Investigations ongoing… • Doesn’t look like an FTS problem • Will FTS meet the deadline for 2.1 support? • Important (critical?) dependency for our goals Storage Middleware

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