Oracle ASM – How ASM Searches Disks and Parameter Source

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I'm a begginer in Oracle ASM and when I will create a diskgroup the ASM shows me this parameter:

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Where is this parameter from? I don't remember set any parameter with this name. I know that usually Oracle set this name as default when is not set a preferential parameter name, but in the creation process I don't saw this configuration.

Best Answer

Normally it is the ASM_DISKSTRING parameter.

But the above screenshot shows that you use ASMLib, which uses a fix format for disks, starting with ORCL:. Whenever you label a disk for ASMLib with oracleasm createdisk, that disk becomes available with the name starting with ORCL:.

So if you set ASM_DISKSTRING to ORCL:*, the ASM instance can find these disks. But as far as I remember, if you do not set anything, even then the ASM instance can find these disks.

By the way, you can also list these disks at /dev/oracleasm/disks.

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