SSA RAID Adapter Installation and User's Guide.
Exposed State
C.2.5.2 Exposed State
A disk array enters the Exposed state when a member disk drive becomes missing (logically or physically) from that array. When a disk array is in the Exposed state, you can reintroduce the missing disk drive, or exchange it for a new one. If necessary, the array management software rebuilds the data that was on the original disk drive before it became missing, then writes that rebuilt data to the replacement disk drive. When the data is correct, the array management software returns the disk array to the Good state.
Read Operations while in the Exposed State: When a read operation is performed on a disk array that is in the Exposed state, the array management software recreates (rebuilds) the data that was contained on the missing disk drive.
Write Operations while in the Exposed State: When a write command is sent to a disk array that is in the Exposed state, the state of the array is changed to Degraded.
_ Copyright IBM Corp. 1996
C.2.5.2 - 1
