Oracle 参数 ASM_DISKSTRING 官方解释，作用，如何配置最优化建议
本站中文解释
：
ASM_DISKSTRING参数指定ASM实例可以使用的磁盘，它只在ASM启动脚本(参数文件)中设置，默认为NULL。
正确设置方法：
1. 确定ASM实例可以使用的磁盘名称，包括字面元素、正则表达式或磁盘号；
2. 在ASM启动脚本(参数文件)中将ASM_DISKSTRING参数设置为可以使用的磁盘串；
例如：假设ASM实例可以使用的磁盘为/dev/sdb1、/dev/sdc1和/dev/sdd1，那么可以将ASM_DISKSTRING参数设置为’/dev/sdb1|/dev/sdc1|/dev/sdd1’。
官方英文解释
ASM_DISKSTRING specifies an operating system-dependent value used by Oracle ASM to limit the set of disks considered for discovery.
| Property | Description |
|---|---|
|
Parameter type |
String |
|
Syntax |
|
|
Default value |
The null string; Oracle Automatic Storage Management discovery finds all disks in an operating system-specific location to which the Oracle Automatic Storage Management instance has read/write access. |
|
Modifiable |
|
|
Modifiable in a PDB |
Yes |
|
Basic |
No |
|
Oracle RAC |
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 |
Note:
This parameter may only be specified in an Oracle Automatic Storage Management (Oracle ASM) instance.
When a new disk is added to a disk group, each Oracle ASM 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 Oracle ASM 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.
See Also:
Oracle Automatic Storage
Management Administrator’s Guide for more information and examples of using this parameter
