HP Serviceguard Extension for RAC (SGeRAC) manual Network Planning for Cluster Communication

Manual Startup and Shutdown

Manual RAC instance startup and shutdown is supported through the following commands: srvctl or sqlplus.

Shared Storage

It is expected the shared storage is available when the RAC instance is started. Since the RAC instance expects the shared storage to be available, ensure the shared storage is activated. For SLVM, the shared volume groups must be activated and for CVM, the disk group must be activated. For CFS, the cluster file system must be mounted.

Oracle Cluster Software requires shared storage for the Oracle Cluster Registry (OCR) and a vote device. Automatic Storage Management (ASM) can not be used for the OCR and vote device in prior Oracle 11gR2 versions since these files must be accessible before Oracle Cluster Software starts.

For Oracle 10g, the minimum required size for each copy of the OCR is 100 MB, and for each vote disk it is 20 MB. For Oracle 11gR2, the minimum required size for each copy of the OCR is 300 MB, and for each vote disk it is 300 MB.

The Oracle OCR and vote device can be created on supported shared storage, including SLVM logical volumes, CVM raw volumes, and CFS file systems. Oracle 11gR2 supports OCR and vote device on ASM over SLVM, ASM over raw device files, and Cluster File System (CFS).

Network Planning for Cluster Communication

The network for cluster communication is used for private internal cluster communications. Although one network adapter per node is sufficient for the private network, it is recommended that a minimum of two network adapters for each network to be used for higher availability.

NOTE: Starting with SGeRAC A.11.20, Oracle Grid Infrastructure 11.2.0.2 HAIP feature can

be configured and used in an SGeRAC cluster. All recommended network configuration of SGeRAC cluster are not supported when using HAIP. For information about most recommended network configuration of SGeRAC, see “Cluster Communication Network Monitoring” (page 35) section.

The following are the major categories of inter-clustertraffic in an SGeRAC environment:

•Serviceguard HeartBeat (SG-HB)—Serviceguard heartbeat and communications traffic. SG-HB is supported over single or multiple subnet networks.

•Cluster Synchronization Services Heartbeat (CSS-HB)—CSS heartbeat traffic and communications traffic for Oracle Clusterware. CSS-HB uses a single logical connection over a single subnet network.

•RAC Interconnect (RAC-IC)—RAC instance peer-to-peer traffic and communications for Global Cache Service (GCS) and Global Enqueue Service (GES), formally Cache Fusion (CF) and Distributed Lock Manager (DLM). Network HA is provided by the HP-UX platform (Serviceguard or Auto Port Aggregation (APA)).

•Automatic Storage Management Interconnect (ASM-IC) (only when using ASM, Automatic Storage Management)—ASM instance peer-to-peer traffic. When it exists, ASM-IC should be on the same network as CSS-HB. Network HA is required either through Serviceguard failover or HP APA .

•Global Atomic Broadcast/Link Level Traffic (GAB/LLT) (only when using CFS/CVM)—Symantec cluster heartbeat and communications traffic. GAB/LLT communicates over link level protocol

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