Some possible header_status of ASM disk
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UNKNOWN - Automatic Storage Management disk header has not been read
CANDIDATE - Disk is not part of a disk group and may be added to a disk group with the ALTER DISKGROUP statement
INCOMPATIBLE - Version number in the disk header is not compatible with the Automatic Storage Management software version.
PROVISIONED - Disk is not part of a disk group and may be added to a disk group with the ALTER DISKGROUP statement. The PROVISIONED header status is different from the CANDIDATE header status in that PROVISIONED implies that an additional platform-specific action has been taken by an administrator to make the disk available for Automatic Storage Management.
MEMBER - Disk is a member of an existing disk group. No attempt should be made to add the disk to a different disk group. The ALTER DISKGROUP statement will reject such an addition unless overridden with the FORCE option
FORMER - Disk was once part of a disk group but has been dropped cleanly from the group. It may be added to a new disk group with the ALTER DISKGROUP statement.
CONFLICT - Automatic Storage Management disk was not mounted due to a conflict
FOREIGN - Disk contains data created by an Oracle product other than ASM. This includes datafiles, logfiles, and OCR disks.
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UNKNOWN - Automatic Storage Management disk header has not been read
CANDIDATE - Disk is not part of a disk group and may be added to a disk group with the ALTER DISKGROUP statement
INCOMPATIBLE - Version number in the disk header is not compatible with the Automatic Storage Management software version.
PROVISIONED - Disk is not part of a disk group and may be added to a disk group with the ALTER DISKGROUP statement. The PROVISIONED header status is different from the CANDIDATE header status in that PROVISIONED implies that an additional platform-specific action has been taken by an administrator to make the disk available for Automatic Storage Management.
MEMBER - Disk is a member of an existing disk group. No attempt should be made to add the disk to a different disk group. The ALTER DISKGROUP statement will reject such an addition unless overridden with the FORCE option
FORMER - Disk was once part of a disk group but has been dropped cleanly from the group. It may be added to a new disk group with the ALTER DISKGROUP statement.
CONFLICT - Automatic Storage Management disk was not mounted due to a conflict
FOREIGN - Disk contains data created by an Oracle product other than ASM. This includes datafiles, logfiles, and OCR disks.
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