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Oracle® Database Reference 10g Release 2 (10.2) Part Number B14237-02 |
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# ASM_DISKSTRING

Property | Description
--- | ---
Parameter type | String
Syntax | `ASM_DISKSTRING =` `discovery_string` `[,` `discovery_string` `] ...`
Default value | The null string; Automatic Storage Management discovery finds all disks in an operating system-specific location to which the Automatic Storage Management instance has read/write access.
Modifiable | `ALTER SYSTEM`
Real Application Clusters | Multiple instances can have different values. Different nodes might see the same disks under different names; however, each instance must be able to use its `ASM_DISKSTRING` to discover the same physical media as the other nodes in the cluster.

Note: This parameter may only be specified in an Automatic Storage Management instance.

`ASM_DISKSTRING` specifies an operating system-dependent value used by Automatic Storage Management to limit the set of disks considered for discovery. When a new disk is added to a disk group, each Automatic Storage Management instance that has the disk group mounted must be able to discover the new disk using the value of `ASM_DISKSTRING`.

In most cases, the default value will be sufficient. Using a more restrictive value may reduce the time required for Automatic Storage Management to perform discovery, and thus improve disk group mount time or the time for adding a disk to a disk group. A "?" at the beginning of the string gets expanded to the Oracle home directory. Depending on the operating system, wildcard characters can be used. It may be necessary to dynamically change `ASM_DISKSTRING` before adding a disk so that the new disk will be discovered.

An attempt to dynamically modify `ASM_DISKSTRING` will be rejected and the old value retained if the new value cannot be used to discover a disk that is in a disk group that is already mounted.