some possible mount_status of ASM DISK
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MISSING - Automatic Storage Management metadata indicates that the disk is known to be part of the Automatic Storage Management disk group, but no disk in the storage system was found with the indicated name
CLOSED - Disk is present in the storage system but is not being accessed by Automatic Storage Management
OPENED - Disk is present in the storage system and is being accessed by Automatic Storage Management. This is the normal state for disks in a database instance which are part of a Disk Group being actively used by the instance.
CACHED - Disk is present in the storage system, and is part of a disk group being accessed by the Automatic Storage Management instance. This is the normal state for disks in an Automatic Storage Management instance which are part of a mounted disk group.
IGNORED - Disk is present in the system, but is ignored by ASM because of one of the following:
- The disk is detected by the system library, but is ignored because an ASM library discovered the same disk
- ASM has determined that the membership claimed by the disk header is no longer valid
CLOSING - ASM is in the process of closing this disk
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