This Controller Can See The Drives But The Other Controller Can't; The Redundant Controllers Installed Are Not The Same Model; This Controller Can't See The Drives But The Other Controller Can; Unable To Communicate With Drive On Scsi Port X, Drive Id Y - HP ProLiant ML370 Generation 4 Reference And Troubleshooting Manual

222 HP ProLiant ML370 Generation 4 Server Reference and Troubleshooting Guide
4. Repeat these steps with the other controller.
If both controllers give POST messages in one slot but not the other, it is a
system board problem. If one of the controllers gives POST messages and the
other controller does not, replace the controller that is giving the POST
messages. Contact an authorized service provider for any warranty replacements.

This Controller Can See the Drives but the Other Controller Can't

Description: The other controller in the redundant controller configuration
cannot recognize the drives, but this controller can.
Action: Resolve any other errors and then rerun ADU.

The Redundant Controllers Installed are not the Same Model...

...SOLUTION: Power down the system and verify that the redundant controllers are
different models. If they are different models, replace the other controller with the same
model as this one.
Description: ADU detected two different controller models installed in a
redundant controller configuration. This is not supported and one or both
controllers may not be operating properly.
Action: Use the same controller models for redundant controller configurations.

This Controller Can't See the Drives but the Other Controller Can

Description: The other controller in the redundant controller configuration can
recognize the drives, but this controller cannot.
Action: Resolve any other errors and then rerun ADU.

Unable to Communicate with Drive on SCSI Port X, Drive ID Y

Description: The array controller cannot communicate with the drive.
Action: If the hard drive amber LED is on, replace the drive.