Using Serviceguard Extension for RAC, 10th Edition, April 2011

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 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.
IMPORTANT: If you are using RAC HAIP, separate Serviceguard and RAC communication into
separate subnets to prevent any issues.
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.
30 Serviceguard Configuration for Oracle 10g, 11gR1, or 11gR2 RAC