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

Component products and processes of SF Oracle RAC
Table 1-1 lists the component products of SF Oracle RAC.
Table 1-1
SF Oracle RAC component products
DescriptionComponent product
Enables simultaneous access to shared volumes based on
technology from Veritas Volume Manager (VxVM).
See “Cluster Volume Manager (CVM)” on page 30.
Cluster Volume
Manager (CVM)
Enables simultaneous access to shared file systems based on
technology from Veritas File System (VxFS).
See “Cluster File System (CFS)” on page 32.
Cluster File System
(CFS)
Manages Oracle RAC databases and infrastructure components.
See “Veritas Cluster Server” on page 35.
Veritas Cluster Server
(VCS)
Provides the interface with the Oracle Disk Manager (ODM) API.
See “Oracle Disk Manager” on page 34.
Database Accelerator
Manages cluster membership and communications between cluster
nodes.
See “RAC extensions” on page 41.
RAC Extensions
Communication infrastructure
To understand the communication infrastructure, review the data flow and
communication requirements.
Data flow
The CVM, CFS, ODM, and Oracle RAC elements reflect the overall data flow, or
data stack, from an instance running on a server to the shared storage. The various
Oracle processes composing an instance -- such as DB Writers, Log Writer,
Checkpoint, and Archiver -- read and write data to the storage through the I/O
stack. Oracle communicates through the ODM interface to CFS, which in turn
accesses the storage through the CVM.
Figure 1-3 represents the overall data flow.
23Overview of Veritas Storage Foundation for Oracle RAC
Component products and processes of SF Oracle RAC