Caution - Replacing an EMS or hard drive cage with an incompatible version can halt a DCU. The DCU will be unusable until a compatible component is installed.
If you see this error message, an IOU contains incompatible EMSs and hard drive cages:
SP> NOTICE: Exclude all of /SYS/DCUx. Reason: Mixing M5 and M6 HDDBP/BaseIO cards in the same DCU
HDDBP refers to the hard drive cage. BaseIO card refers to the EMS.
First-generation EMSs and hard drive cages are incompatible with their second-generation counterparts.
You can mix first-generation and second-generation EMSs and hard drive cages in the same server if you follow these rules:
Both hard drive cages in an IOU must be of the same generation. Do not mix first-generation and second-generation hard drive cages in the same IOU. See Determine Hard Drive Cage and EMS Part Numbers.
Do not mix different generations of EMSs and hard drive cages in the same IOU. Use first-generation EMSs only with first-generation hard drive cages, and use second-generation EMSs only with second-generation hard drive cages.
First-generation servers require upgraded firmware to use second-generation components. Refer to the latest Server Product Notes, upgrading the SPARC M5-32 server.
Note - If a first-generation EMS or a first-generation hard drive cage fails and a first-generation replacement is no longer available, replace the two hard drive cages in the IOU, along with all four EMSs with second-generation parts to ensure compatibility. Any remaining first-generation IOUs in the same server do not need to be upgraded if their components are working properly.
Note - If the server contains a mix of IOUs with first-generation and second- generation parts, you will see a difference between LED behavior on the hard disk drives and SSDs in the IOUs. If an IOU has first-generation hard drive cages, the LEDs on the drives stay lit when the host is stopped. If an IOU has second-generation hard drive cages, the LEDs on the drives turn off when the host is stopped. In addition, the LEDs on the drives are brighter in an IOU with second-generation hard drive cages.