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„The square root of serving multiple experiments is a single dCache“ - PowerPoint PPT Presentation


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GridKa dCache. LHCb. CMS. compass. cdf. ALICE. dteam. belle. auger. ops. ATLAS dCache. ATLAS. ops. c3grid. astrogrid. medigrid. ingrid. kerndgrid. textgrid. wisent. hepcg. Deadlock situation One dteam file located on ATLAS pool PNFS id not known to dCache

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the square root of serving multiple experiments is a single dcache

GridKa dCache

LHCb

CMS

compass

cdf

ALICE

dteam

belle

auger

ops

ATLAS dCache

ATLAS

ops

c3grid

astrogrid

medigrid

ingrid

kerndgrid

textgrid

wisent

hepcg

  • Deadlock situation
  • One dteam file located on ATLAS pool
  • PNFS id not known to dCache
  • Pool tried flushing file to tape
  • PnfsManager did not know file
  • PnfsManager run in deadlock situation
„The square root of serving multiple experiments is a single dCache“

D.Ressmann, S.Halstenberg, C.Jung, A.Trunov, J.van Wezel

  • Motivation
  • Performance problems – bottleneck SRM, PNFS
  • Further single points of failure: PoolManager, PinManager
  • Easier to manage due to less complex configuration
  • VOs do not disturb each other
  • Configuration can be fine tuned for the requirements of the separated VO

GridKa dCache

CMS

ATLAS

ALICE

LHCb

com-pass

cdf

auger

belle

ops

dteam

hepcg

wisent

textgrid

c3grid

kerndgrid

ingrid

9 other D-Grid VOs

medigrid

astrogrid

Separation

  • Procedure
  • Pool migration (hosts only serving ATLAS pools)
  • Installation of new ATLAS administration nodes
  • Complete downtime of original dCache instance
    • dump of SRM and PNFS DB
    • Remove ATLAS configuration:
      • Switch off all ATLAS pools
      • PoolManager
      • Pin- and SpaceManager entries
      • PNFS DBs
    • Restart original dCache instance
  • Reload DB dumps in new ATLAS instance
    • Remove all non ATLAS entries from DBs
    • Change dCacheSetup on all ATLAS pools
  • Start ATLAS instance

D-Grid dCache

9 other D-Grid VOs

  • ATLAS nodes
  • Head node
  • PNFS deamon, PnfsManager, postgres DB
  • SRM,utilityDomain, postgres DB
  • gPlazma
  • Billing DB
  • dCap door
  • 4 gridftp doors
  • 23 pool nodes

Further information today:

037 - Improving data distribution on disk pools for dCache

070 - dCache administration at the GridKa Tier-1-center, ready for data taking

069 - Reference installation for the German grid Initiative D-Grid

Forschungszentrum Karlsruhe GmbH

Hermann-von-Helmholz-Platz 1

D-76344 Eggenstein-Leopoldshafen

Doris.Ressmann@iwr.fzk.de

Steinbuch Centre for Computing