Storage (ieri, oggi e domani) Luca dell’Agnello INFN-CNAF

Tematiche della sessione Consolidamento del servizio  Supporto StoRM  Stato del MSS al Tier1  Integrazione gestione sistemi storage per il calcolo e per i servizi Uno sguardo sul futuro  Test di file-system/sistemi di storage per HEP  Idee (e dubbi ) sul futuro dello storage Incipit discussione in vista meeting storage WLCG

StoRM Product team (~ 3.5 FTE) ha in carico sviluppo, test, certificazione, supporto (v. talk F. Giacomini)  ….ed alcune componenti “esterne” Plug-in gridftp per checksum Layer GPFS-TSM Stage roll-out con “early adopters”  ~ 2 settimane  INFN-T1, INFN-CNAF, INFN-BARI, INFN-PADOVA, … Prevista procedura per “urgent fix”  Solo se per problemi bloccanti AND solo se non esiste workaround  Rilascio rpm ad hoc per sito con problema 3 livelli supporto  Helpdesk di EGI (smistamento ticket)  Support unit in INSPIRE (esperti in shift)  Sviluppatori: da interpellarsi solo per bug!

4 GEMSS: GPFS/TSM/StoRM integration GPFS is a parallel file system while TSM is a high-performance backup/archiving solution Both products (from IBM) are widely used (separately) and diffused Large GPFS installation is in production at CNAF since 2005, with increasing disk space and number of users 2 PB of net disk space (~ 6 PB in Q2 2010) partitioned in several GPFS clusters 150 disk-servers (NSD + GridFTP) connected to the SAN We combined the features introduced in version 3.2 of GPFS and TSM with StoRM, to provide a transparent grid-enabled HSM solution. An interface between GPFS and TSM (named GEMSS) was implemented to enable tape-ordered recalls CASTOR phase-out nearly completed (Q1 2010)

Disk-centric system with five fundamental components 1. GPFS: disk-storage software infrastructure 2. TSM: tape management system 3. StoRM: SRM service 4. GEMSS: StoRM-GPFS-TSM interface 5. GridFTP: WAN data transfers 5 ILM DAT A FILE GEMSS DATA MIGRATION PROCESS DAT A FILE StoRM GridFTP GPFS DAT A FILE WAN data transfers DAT A FILE TSM DAT A FILE GEMSS DATA RECALL PROCESS DAT A FILE WORKER NODE Building blocks of the new system SAN TAN LA N SAN 5

Lo storage: un tema sempre caldo in ambito WLCG Revisione critica del modello attuale di storage  Forte spinta dagli esperimenti  Varie idee non ancora focalizzate Alcune “tappe” fissate  Storage jamboree (Amsterdam Giugno)  WLCG workshop (London 7-9 Luglio) Porteremo nostra esperienza come INFN

Links Storage Jamboree (June ) ?confId= ?confId=92416 WLCG workshop (July )

StoRM production layout for CMS 2x10 Gbps 500 TB GPFS file system 4 GridFTP servers (4x2 Gbps) 6 NSD servers (6x2 Gbps on LAN) HSM STA HSM STA HSM STA 8x4 Gbps 3x4 Gbps 8x4 Gbps 11 tape drives 1 TB per tape 1 Gbps per drive TSM server SAN TAN 6x4 Gbps TAPE LIBRAR Y LAN 3 TSM Storage Agents and HSM clients 20x4 Gbps DB2 SA N DB2 9

StoRM layout for ATLAS (T1D0) 2x10 Gbps 16 (  60 TB) GPFS fs 6 GridFTP servers (6x2 Gbps) 4 NSD servers (4x2 Gbps on LAN) HSM STA HSM STA 8x4 Gbps 2x4 Gbps 8x4 Gbps 11  13 tape drives 1 TB per tape 1 Gbps per drive TSM server SAN TAN 4x4 Gbps TAPE LIBRAR Y LAN TSM Storage Agents and HSM clients 20x4 Gbps DB2 SA N DB2 10