this is a build slide
first the current ASM paradigm.
Then we add a volume manager that allows us the mount ASM Cluster or single instance file systems,
take snapshots of those FS,
and even lets us mount Linux ext3 file systems on these volumes.
In earlier releases of Oracle Cluster Ready Service (CRS) and Oracle Real Application Clusters (RAC), you had to provision storage for Oracle Cluster Registry (OCR) /Vote files, ASM Spfile outside ASM. Prior to 10g you also had to find either a cluster file system or raw devices for the database files.
Starting with Database 10g, database files could be stored in ASM. Now, in 11gR2, OCR/Vote files as well ASM Spfile can be stored in ASM.
Wait! Isn’t there a chicken and egg problem. How can you put the Cluster Registry in ASM when ASM isn’t installed and running? We’re not really going to discuss that today, but through cunning and magic, the CRS development team figured it out.
Additionally, we introduce the ASM Filesystem, thus all other extended database related files can also be stored in ASM via ACFS filesystems. Note that files stored traditionally in ASM will continue to be stored in ASM. ACFS is not certified to be used to store database files.
ACFS should house Database Oracle Home and other extensible data file types associated with the database
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