[Node-02: statd: monitor.shelf.fault:alert]: Critical fault reported on disk storage shelf attached to channel 0a. [Node-01: statd: monitor.shelf.fault:alert]: Critical fault reported on disk storage ...[Node-02: statd: monitor.shelf.fault:alert]: Critical fault reported on disk storage shelf attached to channel 0a. [Node-01: statd: monitor.shelf.fault:alert]: Critical fault reported on disk storage shelf attached to channel 0a. Element Status Status Bytes Status Descriptions 1 [IOM12E A] : CRITICAL 02,18,00,40 NO ACPP, INBACP, FAIL 2 [IOM12E B] : CRITICAL 02,18,00,40 NO ACPP, INBACP, FAIL Disabling and re-enabling the ACP on the system doesn't help.