In cloud or virtualized infrastructure, an underlying network flap can interrupt multipath software (e.g., Device Mapper Multipath). If all redundant paths to a LUN drop simultaneously, ASM interprets this block-level device vanishing act as a device failure. ASM-ALERTLOG-Output-Failure-CELLI03-and-CELL01
| | Component | Failure Description | Severity | First Detected | |--------------|---------------|------------------------|--------------|--------------------| | ASM-042 | Disk Group Mount Consistency | Disk group DATA – one offline disk not yet force-mounted after node reboot | Warning | [Date/Time of scan] | asm health checker found 1 new failures
By default, Oracle ASM expects a periodic heartbeat write to the Partnership and Status Table (PST) on the disks. If your storage area network (SAN) or Network Attached Storage (NAS) undergoes a controller failover or a brief network hang that lasts longer than the threshold (typically 15 seconds), the heartbeat fails. The Health Checker registers this temporary drop as a localized failure. 3. Duplicate Disk Discovery ( ORA-15063 / ORA-15020 ) If your storage area network (SAN) or Network
If the health check indicates metadata issues, you may need to run a manual check on the disk group. Duplicate Disk Discovery ( ORA-15063 / ORA-15020 )
This message usually appears alongside other ORA- errors and signals that ASM has identified a problem with the storage layer. Common triggers include: Disk Failures