Using Serviceguard Extension for RAC, 9th Edition, September 2010

NOTE: srvctl and sqlplus are Oracle commands.
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 100MB, and for each vote
disk it is 20MB. For Oracle 11gR2, the minimum required size for each copy of the OCR is 280MB,
and for each vote disk it is 280MB.
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.
The following are the major categories of inter-cluster traffic 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 APA bonding.
• 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 (DLPI) and supported over Serviceguard heartbeat subnet networks, including
primary and standby links.
The most common network configuration is to have all interconnect traffic for cluster
communications to go on a single heartbeat network that is redundant so that Serviceguard
monitors the network and resolves interconnect failures by cluster reconfiguration.
The following are situations when it is not possible to place all interconnect traffic on a single
network:
Network Planning for Cluster Communication 31