The ASM Health Checker can trigger this alert for a variety of reasons. Below are the most frequent root causes encountered in production environments.
Once the underlying issue is resolved:
ALTER DISKGROUP <diskgroup_name> ONLINE ALL;
ALTER DISKGROUP <diskgroup_name> CHECK;
Then re-run:
asmcmd health check
The failure count should return to 0.
$ asmcmd health check
...
FAILURE: Disk group DATA – Disk DATA_0002 is offline
...
The phrase "1 new failures updated" is precise. It communicates three key pieces of information: asm health checker found 1 new failures updated
It is crucial to understand that this is not an immediate fatal error. ASM is reporting that it found something abnormal, but the disk group may still be mounted and operational (often in a degraded state). The ASM Health Checker can trigger this alert
Set up alerting on v$asm_diskgroup.offline_disks and v$asm_disk.state. Tools like Oracle Enterprise Manager (OEM) or custom scripts can detect failures before they impact applications. Then re-run:
asmcmd health check