Often, the health checker finds a "failure" simply because a storage array is too slow. Monitor your OS-level tools like iostat or sar .
SELECT group_number, name, path, state, failgroup, mode_status FROM v$asm_disk WHERE state != 'NORMAL'; asm health checker found 1 new failures updated
When adding new disks, ensure they are properly recognized and initialized by ASM to avoid ORA-15196. Often, the health checker finds a "failure" simply