The array information is stored on the drives and in controller nvram.
The EMU controls environmental status plus handles some drive events. Example hot remove and hot add.
Look at the show tech_support, your LUNs are not showing a drive fault of any kind. If you experience a drive fault, the would be line added to the faulty disk in your LUN.
Just as a safety precaution, locate the cpqacuxe.exe or hpacuxe.exe. At a cmd prompt, under the directory of the executible. issue the cmd.
cpqacuxe -c
This will capture your servers Array configuration plus the MSA's. The file created will be acucapt.ini
cpqacuxe -h will popup a help screen.
If needed you can edit out the embedded Smart Array configuration information, leaving the MSA information. execute, cpqacuxe -i acucapt.ini This will recreate your configuration back to the original state.
It's difficult to say exactly if it is the backplane or the EMU. The only thing I can think of on the backplane that could cause something like this is perhaps one of the resistors in a RNET, used for the SCSI terminators either opened or shorted with another resistor in the RNET.
Tomorrow I'll do a little more digging. I would be interested in capturing this equipment.
