on TEG outcomes WLCG workshop May 19 2012 v03 Operations and Tools WG1 ALICE monitoring versatile amp homogeneous Workload amp data management services Common framework MonALISA ID: 581951
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Slide1
ALICE commentson TEG outcomes
WLCG workshop
May 19, 2012
v0.3Slide2
Operations and Tools – WG1ALICE monitoring versatile & homogeneous
Workload & data management, services
Common framework –
MonALISAHistory data since mid 2006, predating DashboardApplications instrumented with common libraryVOboxes collect site specific monitoring infoInfo exposed to clients via web and subscriptionsSAM complementaryCommon WLCG viewShould be able to import MonALISA results!
2Slide3
Operations and Tools – WG3 - 1Build using SVN, CM
ake
and native
toolsNightly and on demandCDash and CTest comingDependencies managed by AliRootPre-build distributions for SLC5, Ubuntu, MacOSXTested and working for other Linux flavors, including SL(C)6
3Slide4
Operations and Tools – WG3 - 2SW distribution based on BitTorrentShared areas being decommissioned
Pilot jobs fetch what is needed and serve other pilots at the same site
Architecture has no single point of failure
Sites need to deploy nothing on the WNJust allow for well-constrained Torrent trafficWorks for non-WLCG, opportunistic / cloud resourcesWhere WLCG-specific means may not be available
4Slide5
Data Management & DatabasesSee “shopping list”https://
twiki.cern.ch/twiki/bin/view/LCG/WLCGTEGDataManagement_ALICE
Single AliEn catalogue model – all files, all replicas, all metadata – since 2003 ! As of today – 900M entries (LFNs/PFNs)Data placement – SE autodiscoveryDatabasesOffline Conditions DB frameworkAliEn file
catalogue
+ ROOT files
5Slide6
Storage ManagementXRootD for everything – since 2007 !Data placement, storage
autodiscovery
Federation
Tape SEs for raw data and old productionsPrivileged accessCurrent year’s Pb data should be fully onlineDisk SEs used by everyoneAutomatic, user specified replication6Slide7
Workload ManagementVObox submits pilots to its own siteCREAM functionality quite satisfactory
Pioneered by ALICE!
Whole nodes, multi-core jobs
Good for job efficiency, development foreseenVirtualization – “don’t ask, don’t tell”CloudsNot urgent, waiting for business model in HEPGrid usage already cloud-like
T1-T2 distinction blurred for storage & brokering
7Slide8
Security AliEn security model uses envelopesDescribe which user can access (read/write) which files on which SEs
No need nor desire for general-purpose user proxies on the WN
gLExec could be called with a specially crafted proxy only usable for that purpose
Will be investigated this yearAnother idea to be pioneeredAliEn LDAP server handles DN changes8