Communicating about the incident
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If this occurred while adding disks, it might be due to a race condition.
to check the status of your failure groups or disk redundancy? asm health checker found 1 new failures updated
The alert string indicates that the Oracle Automatic Storage Management internal diagnostic framework has detected a critical structural event, typically resulting in an automated, non-clean dismount of an active disk group. This error is commonly found in the alert_+ASM.log file. It appears when a storage failure cascades past individual disk-level tolerances, forcing the ASM instance to halt I/O operations and initiate a cluster reconfiguration to preserve data integrity. Anatomy of the Failure
If disks are physically present but not recognized, check pvid=yes settings or try to unmount and remount the diskgroup. Scenario C: Persistent I/O Errors If a specific disk shows consistent read/write errors:
The disk group is normal; the issue might be confined to a single disk. Communicating about the incident Your public links are
Look for any disks where the header_status is CANDIDATE (instead of MEMBER ) or mode_status is OFFLINE . 3. Check for Ongoing Rebalances
When the health checker encounters these physical corruptions during its integrity checks, it will log the failure.
. This is often triggered when a monitored resource crosses a predefined threshold or a critical daemon stops responding. Immediate Review Checklist To review and resolve this failure, follow these steps: Identify the Failure Source : Navigate to Security > Reporting > Settings > ASM Alerts If this occurred while adding disks, it might
Log in to the ASM instance via SQL*Plus and query the internal view to see exactly what the checker found:
Automatic Storage Management (ASM) is a crucial component of Oracle databases, providing a robust and efficient storage management system. However, like any complex system, ASM can encounter issues that impact database performance and security. To identify and address these issues, Oracle provides the ASM Health Checker, a utility that monitors ASM's overall health and alerts administrators to potential problems. In this essay, we will discuss the importance of ASM Health Checker, its functionality, and what it means when it reports "Found 1 new failures updated."
: Adding disks to or resizing an ASM Cluster File System (ACFS) can sometimes trigger failures if voting files cannot be refreshed or membership refresh fails. Recommended Diagnostic Steps
If a specific disk is permanently offline: