Bad blocks on physical storage devices are another common cause. Even if the storage appears healthy at a high level, individual blocks can become corrupted due to:

Update your UDEV rules file if permissions reset after a reboot. Reload UDEV triggers using udevadm trigger . Clear the Health Checker Alert

: ASM may force a dismount if too many disks in a failure group are lost, exceeding the redundancy limit.

When managing Oracle Automatic Storage Management (ASM), receiving an alert stating can be alarming. This message usually appears in the ASM alert log or Oracle Enterprise Manager (OEM) and indicates that the background health check process has detected a potential issue with the disk group structural integrity or a device, which requires immediate attention to avoid downtime.

To prevent ASM health checker issues, follow these best practices:

Verify the failure count resets to zero in the summary output.

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