The Oracle ASM instance mounts disk groups to make ASM files available to database instances. # ps -ef | grep asm <-shows what asm uses (it has pmon, smon.)ĪSM requires a special type of Oracle instance to provide the interface between a traditional Oracle instance and the storage elements presented to AIX. ASM allows disk management to be done using SQL statements (such as CREATE, ALTER, and DROP), Enterprise Manager or with command line.ĪSM is a single DB instance (as a normal DB instance would be), with its own processes. The performance is comparable to the performance of raw devices. When a file is created within ASM, it is automatically striped across all disks allocated to the disk groups. A disk group consists of multiple disks and for each ASM disk group, a level of redundancy is defined (normal (mirrored), high (3 mirrors), or external (no ASM mirroring)). Oracle ASM uses disk groups to store data files. ASM is Oracle's recommended storage management solution.
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