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RAC - Test
1. RAC Best Practices on Linux Kirk McGowan Technical Director – RAC Pack Server Technologies Oracle Corporation Session id: 40136 Roland Knapp Principal Member Technical Staff – RAC Pack Server Technologies Oracle Corporation
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4. RAC Hardware Architecture Clustered Database Servers Mirrored Disk Subsystem High Speed Switch or Interconnect Hub or Switch Fabric Network Centralized Management Console Storage Area Network Low Latency Interconnect ie. VIA or Proprietary Users No Single Point Of Failure Shared Cache
5. RAC Software Architecture Shared Disk Database Shared Data Model Shared Memory/Global Area shared SQL log buffer . . . . . . Shared Memory/Global Area shared SQL log buffer Shared Memory/Global Area shared SQL log buffer Shared Memory/Global Area shared SQL log buffer GES&GCS GES&GCS GES&GCS GES&GCS
6. RAC on Linux HW & SW Components public network Node1a shared storage redo log instance 1 … redo log instance 2 … control files database files Node2a cluster interconnect cache to cache N3 N4 Nn concurrent access from every node = “scale out” more nodes = higher availability Unbreakable Linux Unbreakable Linux ORACM ORACM Oracle 9 i RAC instance 1 Oracle 9 i RAC instance 2 DB cache DB cache
17. Installation Flowchart for Red Hat Linux AS 2.1 Boot Choose Language Select Keyboard & Mouse Choose – Advanced Server Option Use DRUID for Partition Setup Select Boot Loader Configure Network Configure Timezone Account Configuration Select Graphic Mode Boot Floppy Creation Installation Complete / Reboot
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22. Installation Flowchart for OCFS Install the rpm’s on all nodes Run ocfstool as root (configures /etc/ocfs.conf) on all nodes Run load_ocfs (insmod will load ocfs.o) on all nodes Create partition on the primary node Run ocfstool to format and mount your new filesystem Mount the new filesystem on all nodes Edit rc.local or equivalent add load_ocfs and ‘mount –t ocfs <device> <mountpoint’ Download the latest OCFS rpm’s from www. ocfs .org
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26. Installation Flowchart for oracm and Oracle Install the oracm from the 9.2.0.1 CD-ROM Configure ocmargs.ora and cmcfg.ora Load the softdog and start with ./ocmstart.sh the cluster manager on both nodes Install 9.2.0.1 software with the RAC option Kill the oracm and watchdog process modify ocmargs.ora and cmcfg.ora (remove watchdog) Load the hangcheck-timer module with lsmod Install the oracm from the 9.2.0.3 patchset Start with ./ocmstart.sh the cluster manager Install the 9.2.0.3 patchset Configure private interconnect and quorum device Fix empty directory bug
27. Hangcheck NM, and CM Flow (After V9.2.0.2) Oracle Instance Cluster Manager (including Node Monitor) Hangcheck-timer User-mode Kernel-mode Oracm maintains both, node status view and instance status view. The hangcheck-timer monitors the kernel for hangs, and resets the node if needed.
56. Post Installation Variable SGA Reserved for kernel DB Buffers (SGA) Default Code, etc. 0xFFFFFFFF 0xC0000000 0x50000000 0x40000000 0x00000000 Variable SGA Reserved for kernel DB Buffers (SGA) After Relink Code, etc. 0xFFFFFFFF 0xC0000000 0x15000000 0x10000000 0x00000000 mapped_base (/proc/<pid>/mapped_base) sga_base (relink Oracle) Lowering of mapped base
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