Update your UDEV rules file if permissions reset after a reboot. Reload UDEV triggers using udevadm trigger . Clear the Health Checker Alert
When adding new disks, ensure they are properly recognized and initialized by ASM to avoid ORA-15196.
Understanding the ASM Health Checker Warning The message is a critical alert generated by the Oracle Automatic Storage Management Cluster File System (ACFS) or Oracle Grid Infrastructure health framework. asm health checker found 1 new failures updated
Temporary SAN outages, faulty Host Bus Adapters (HBAs), or bad network switches can break communication lines between the ASM instance and the physical LUNs.
Intermittent loss of connectivity to the SAN/LUNs causes heartbeat timeout warnings (e.g., Waited 15 secs for write IO ). Update your UDEV rules file if permissions reset
You may need to drop the failed disk and add a replacement, then monitor the ARB0 background process to ensure a successful rebalance. KB88485 - My Oracle Support
What the message means
Slow response times from the storage subsystem cause the Oracle ASM instance to drop the impacted disks.