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ORA-15024: Discovered Duplicately Numbered ASM Disk (Doc ID 1457185.1)

Last updated on APRIL 08, 2025

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.4 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

On : 10.2.0.4 version, STORAGE

ASM failed to start

after server reboot, the disk group can not mount,If you try to mount it you may get below error

 SQL> alter diskgroup <DGNAME> MOUNT;
alter diskgroup <DGNAME> MOUNT
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15024: discovered duplicately numbered ASM disk 4

Changes

 There could have been duplication of Major/Minor number at the os level.

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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