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ASGC Site Status

ASGC Site Status. 3D Workshop @ CERN. Outlines. Current activity Hardware and software specifications Configuration issues and experience sharing. Current activity. System migration to phase out the old system based on a mixture of Pentium-4 and Itanium-II machines Oracle RAC build-up

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ASGC Site Status

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  1. ASGC Site Status 3D Workshop @ CERN

  2. Outlines • Current activity • Hardware and software specifications • Configuration issues and experience sharing

  3. Current activity • System migration • to phase out the old system based on a mixture of Pentium-4 and Itanium-II machines • Oracle RAC build-up • to power the Oracle-related LCG services by an extendable and more reliable Oracle system

  4. Why migration? • Previous Oracle services were run by Itanium-II IA64 machines • Hardware complexity on Itanium servers made configuration quite time consuming. More standard architectures can simplify deployment. • If adopting Itanium servers, it appears that future RAC expansion will also require us to purchase Itanium servers. This is not a cost effective solution for us. • The new system is running on Pentium-D

  5. Past Now System evolution and experience in building Oracle RAC system

  6. RAC group for other LCG services RAC group for 3D Dual channel & redundant controller Hardware configuration • Four servers • CPU : Intel Pentium-D 830 3.0 GHz • Memory 2G (ECC) • Local Disk S-ATA2 80G 7200 rpm • Fiber Channel LSI 7102XP-LC, PCI X 1 • SAN Switch : Silkworm 3850 16 ports • Backend Raid subsystem: StorageTek B280 • Each RAC group shares 1.7TB exported from SAN

  7. Software installation • OS • SLC 4, release 2.6.9-34.0.2.EL.cernsmp • Oracle Enterprise Edition Real Application Clusters 10.2.0.1 • manual patch to 10.2.0.2 (identical to CERN setup) • OCFS2 configured • CRS home shared among all cluster • Partition for backup • OEM agent is under re-installation

  8. Configuration issues • Hardware configuration • Complexity of hierarchical SAN configuration may cause the RAC unstable • Redundant controller issues • The node will see and mount the redundant volume as the second physical volume (“rdac” module is needed to avoid this wrong behavior) • Software installation • In the pre-installation stage, default OCFS kernel modules couldn’t be loaded in SLC4 (2.6.9-34-02), recompilation from source is needed

  9. Work around on SLC • Build Oracle RAC 10g Release2 Cluster on IA64 and Scientific Linux CERN 43: http://lists.grid.sinica.edu.tw/apwiki/Build_Oracle_RAC_10g_Release2_Cluster_on_IA64_and_Scientific_Linux_CERN_43?highlight=%28rac%29 • Pres-installation of Oracle RAC: http://lists.grid.sinica.edu.tw/apwiki/Pre-Installation_on_All_Nodes • 3D testbed installation note: http://lists.grid.sinica.edu.tw/taskforcewiki/3D_testbed_installation%3A_oracle?highlight=%28oracle%29 • Oracle RAC installation note: http://lists.grid.sinica.edu.tw/taskforcewiki/Oracle_10g_RAC_Installation?highlight=%28oracle%29 • Oracle 10g RAC: ASM & OCFS http://lists.grid.sinica.edu.tw/taskforcewiki/Oracle_10g_RAC_related_issues%3A_ASM_%26_OCFS?highlight=%28oracle%29 • Oracle EM Grid Control and Agent Installation http://lists.grid.sinica.edu.tw/taskforcewiki/Oracle_EM_Grid_Control_and_Agent_Installation?highlight=%28oracle%29

  10. Extended plan • complete the installation of OEM agent • Experiment support: ATLAS / CMS • migrate Castor 2 name sever into the RAC environment • Migration of FTS backend Oracle is also considered

  11. Summary • The Oracle services has been migrated to the new system running on 1U Pentium-D machines • A 4-node Oracle RAC has been setup with OSFS2 • 10.2.0.1 with manual patch to 10.2.0.2 • 2 nodes are dedicated for 3D • Fiber channel connection to backend storage through SAN switch • 1.7 TBytes storage is supported by a raid system with redundant controller • OEM is under re-installation • All software configuration is based on SLC4 • Site contact • Yi-Ping Wu (jodiewu@gate.sinica.edu.tw) • ASGC OPS (ops@lists.grid.sinica.edu.tw)

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