In
step 7, you specify ASM as your database file storage method. Finally, in step 8 you specify the
parameters for the ASM instance, as you did in Chapter 4.
Automatic Storage Management (ASM) instances, although available for storage management
with standalone Oracle instances, are ideal for use with RAC. ASM eliminates both the need to
FIGURE 10-13 DBCA cluster type options
Chapter 10: Real Application Clusters 373
configure raw devices (raw devices are mapped once within an ASM instance and subsequently
are available for all nodes in the cluster) and the need for a cluster file system for database files.
Cluster file systems such as Oracle Cluster File System (OCFS) are still available if you want your
ORACLE_HOME on a cluster file system instead of a copy on each node in the cluster. However,
Oracle best practices recommends that each node have its own local copy of the Oracle software.
More details on how to configure and use ASM can be found in Chapter 4. If you use ASM, it only
needs to be configured once, during these steps.
NOTE
OCFS version 2.x supports a shared Oracle Home.
The next few screens track the progress of the creation of the ASM instance. After this process
is completed, you are prompted to create the first ASM disk group, as you can see in Figure 10-15.
You choose two of the raw devices available to be the DATA1 disk group using normal redundancy.
Notice that I had to specify /dev/oracleasm/disks/* as the Disk Discovery Path for OUI to recognize
the ASMLib disk groups I created earlier in this chapter.
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