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PROMPT Current ASM disk health: SELECT name, path, state, header_status, mount_status, failgroup FROM v$asm_disk WHERE header_status != 'MEMBER' OR state != 'NORMAL';

A disk may have dropped due to I/O timeouts. If the disk group has Normal or High Redundancy , the group remains mounted, but you must replace the disk.

: ASM health checker found 1 new failures – Severity CRITICAL. Failure type: I/O_LATENCY_HIGH on DATA_0008 , average latency 410ms.