RAID states
The Manager separates RAID member states from the state of the entire array.
The RAID array health reports as OPTIMAL when all the disks are ONLINE.
The entire array is reported as DEGRADED when any RAID member is reported as OFFLINE.
A RAID member reports REBUILD when it is replaced. The incident for the entire array is only cleared when all RAID members report as ONLINE and when the array reports as OPTIMAL.