Veritas Storage Foundation 5.1 SP1 for Oracle RAC Administrator"s Guide (5900-1512, April 2011)

The basic layout has the following characteristics:
■ Multiple client applications that access nodes in the cluster over a public
network.
■ Nodes that are connected by at least two private network links (also called
cluster interconnects) using 100BaseT or gigabit Ethernet controllers on each
system.
If the private links are on a single switch, isolate them using VLAN.
■ Nodes that are connected to iSCSI or Fibre Channel shared storage devices
over SAN.
All shared storage must support SCSI-3 PR.
■ Nodes must be connected with private network links using similar network
devices.
■ Each system has a VxVM encapsulated root drive or an internal disk.
■ The Oracle Cluster Registry, vote disks, and data files configured on the shared
storage that is available to each node.
For Oracle RAC 10g Release 2/Oracle RAC 11g Release 1: The shared storage
can be a cluster file system or raw VxVM volumes.
For Oracle RAC 11g Release 2: The shared storage can be a cluster file system
or ASM disk groups created using raw VxVM volumes.
■ Three standard disks or LUNs used as coordinator disks for I/O fencing.
■ VCS manages the resources that are required by Oracle RAC. The resources
must run in parallel on each node.
SF Oracle RAC includes the following technologies that are engineered to improve
performance, availability, and manageability of Oracle RAC environments:
■ Cluster File System (CFS) and Cluster Volume Manager (CVM) technologies to
manage multi-instance database access to shared storage.
■ An Oracle Disk Manager (ODM) library to maximize Oracle disk I/O
performance.
■ Interfaces to Oracle Clusterware/Grid Infrastructure and RAC for managing
cluster membership and communication.
Figure 1-2 displays the technologies that make up the SF Oracle RAC internal
architecture.
21Overview of Veritas Storage Foundation for Oracle RAC
How SF Oracle RAC works (high-level perspective)