Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 5 - Preparing Shared Storage

ASM Files

Table 5.2 Contents of the v$osm_alias View

Whenever a filename is required from an ASM disk, a mechanism for recognizing ASM file naming syntax is provided. At file creation, certain file attributes are permanently set, such as its protection policy (mirroring) and its striping policy. ASM files are not visible from the operating system or its utilities, but they are visible to database instances, RMAN, and other Oracle-supplied tools.

ASM Templates

Collections of attributes used by ASM during file creation are known as templates. Templates are used to simplify ASM file creation by mapping complex file attribute specifications into a single named object (template). Each Oracle file type has its own default template. Each disk group contains its own set of definition templates. Template names only have to be unique within a single ASM disk group, a template of the same name can exist in different disk groups with each separate template having their own unique properties.

Administrators can change the attributes of the default templates or add their own templates. This lets an administrator specify the appropriate file creation attributes as a template. However, if a DBA needs to change an ASM file attribute after a file has been created, then the file must be copied using RMAN into a new file created with a different template that contains the new attributes.

ASM Disks

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