New Oracle 11g ASM Disk Group compatibility features

With Oracle 11g, there are now two new Disk Group compatibility attributes—compatible.asm and compatible.rdbms. These Disk Group compatibility attributes determine the minimum version of ASM and database instances that can connect to an Oracle 11g ASM Disk Group. By advancing these Disk Group compatibility settings, you can use the new ASM features that are available in the latest release. If you decide to advance these attributes from 10.1 to 11.1, you will enable the following key features that are new to Oracle 11g ASM:

• Preferred mirror read

• Variable size extents

• Fast mirror resync

The software version of ASM determines the default compatibility of newly created Disk Groups. You can override the Disk Group compatibility default setting when you create Disk Groups with the CREATE DISKGROUP SQL statement.

The ALTER DISKGROUP SQL statement can update the compatibility settings for existing Disk Groups.

The compatibility settings for a Disk...