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CHW-14: IOM12 storage module might report intermittent ACP hardware failures

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Issue

An IOM12 storage module might report intermittent Alternate Control Path (ACP) hardware failures. The IOM12 storage module returns to its normal status after a few minutes.
An example of the failure and recovery events:
... 10:40:53 UTC [cluster-01: dsa_worker4: ses.status.ACPError:alert]: DS224-12 (S/N XXXX) shelf 10 on channel 0a ACP Processor error for SAS shelf ACP processor 1: critical status; Alternate Control Path hardware failed. This module is on the rear of the shelf at the top left, on shelf module A.
... 10:43:17 UTC [cluster-01: dsa_worker4: ses.status.ACPInfo:info]: DS224-12 (S/N XXXX) shelf 10 on channel 0a ACP Processor information for SAS shelf ACP processor 1: normal status.

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