Using Serviceguard Extension for RAC, 6th Edition, April 2008

NOTE: srvctl and sqlplus are Oracle commands.
Manual Startup and Shutdown
Manual RAC instance startup and shutdown is supported through the following
commands: srvctlor 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 since these files must be accessible before Oracle Cluster Software
starts. The minimum required size for the OCR is 100MB and for the vote disk is 20
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.
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.
The following are the major categories of inter-cluster traffic in an SGeRAC environment:
• Serviceguard HeartBeat (SG-HB): Serviceguard heartbeat and communications
traffic. 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 APA bonding.
• Global Atomic Broadcast/Link Level Traffic (GAB/LLT) (only when using
CFS/CVM): Symantec cluster heartbeat and communications traffic. GAB/LLT
40 Serviceguard Configuration for Oracle 10g RAC