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Event ID: 9 Source: aac

The device, \Device\Scsi\aac3, did not respond within the timeout period.
I had the same issue and I was using the most recent firmware from Seagate. In my case, the problem was caused by the hot swap cage for the HDD.
If your controller is a Adaptec 2120s or other adaptec controllers and your HDD is a Seagate U320 then this problem happens by a fault in the management of the hard disk. Updating firmware of the hard disk the problem should solve this.
This event is common to many controllers. See event id 9 from adpu160m.
Article ME154690 addresses event 9.

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