You will balance the redundancy built into the shared
disk with the types of disk groups you will create for the RAC. The higher redundancy built into
the disk subsystem hardware can potentially reduce the amount of software redundancy you
specify when you create the database??™s disk groups.
Software Configuration
Although Oracle clustering solutions have been available since version 6, not until version 10g
has there been a native clusterware solution that more tightly couples the database to the volume
management solution. Cluster Ready Services (CRS) is the clustering solution that can be used on
all major platforms instead of an OS vendor or third-party clusterware.
CRS is installed before the RDBMS and must be in its own home directory, referred to as the
CRS_HOME. If you are only using a single instance in the near future but plan to cluster at a later
date, it is useful to install CRS first so that the components of CRS that are needed for ASM and
RAC are in the RDBMS directory structure. If you do not install CRS first, you will have to perform
some extra steps later to remove the CRS-related process executables from the RDBMS home
directory.
After CRS is installed, you install the database software in the home directory, referred to as
the ORACLE_HOME. On some platforms, such as Microsoft Windows, this directory can be a
directory common to all nodes, whereas other platforms, such as Linux, require OCFS version
2.
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