setup iscsi shared disk on oracle enterprise linux OEL5.3 for 9i and 10g RAC
It is a basic requirement to have a shared storage/disk array for Oracle Real Application Clusters to work.
Excerpt from Wikipedia about the difference between RAC and non-RAC oracle databases:
In a non-RAC Oracle database, a single instance accesses a single database. Where the “database” consists of a collection of data files, control files, and redo logs located on disk; the “instance” comprises the collection of Oracle-related memory and operating system processes that run on a computer system.
In an Oracle RAC environment, two or more computers (each with an instance) concurrently access a single database. Basically a single database is being accessed by 2 instances from 2 different servers and hence that single database needs to reside on a shared disk.
