Supported Platforms:
If the underlying issue was a temporary glitch (e.g., a loose fiber cable or a brief network blip), the disk might still be repairable. If the OS can see the disk again, you may be able to issue:
The ASM Health Checker is an internal diagnostic tool embedded within Oracle ASM (introduced in Oracle 11g Release 2 and enhanced in 12c, 18c, 19c, and 21c). Its primary function is to periodically validate the integrity, accessibility, and configuration of ASM disk groups and their underlying disks.
The health checker is part of Oracle's framework. Health Monitor checks examine various layers and components of the database, detecting file corruptions, physical and logical block corruptions, undo and redo corruptions, data dictionary corruptions, and more. Beginning with Oracle Database 11g, this framework has enabled DBAs and automated processes to run diagnostic checks. By default, the database runs health checks on a regular basis, and during the course of these executions, any detected failures are logged to the alert log.
In this article, we will delve into what this error means in 2026, the common causes, and how to identify and resolve it efficiently, citing best practices from Oracle documentation . What Does This Alert Mean?
The Health Monitor is particularly valuable for ASM because it can catch corruption in the metadata of a disk group before that corruption leads to a more catastrophic event, such as a disk group being automatically dismounted. The goal of the health checker is to provide early warnings, allowing DBAs to intervene before issues impact database operations.
The disk group has dropped offline. This indicates a loss of disk quorum. 3. Check for Ongoing Rebalance Operations
The ASM alert log contains a chronological log of messages and errors. Scan for the timestamp of the "ASM Health Checker found 1 new failures" message to see what other errors are logged around the same time. This can provide critical clues about the specific problem.
SELECT group_number, disk_number, name, path, state, mode_status, failgroup FROM v$asm_disk WHERE state != 'NORMAL';
: A failure might be triggered if a disk group drops below its required redundancy level (e.g., a disk failing in a "Normal" redundancy group). Space Constraints