"FIXME driver has no support for subenclosures" errors during booting on Red Hat Enterprise Linux 6

Issue

• "FIXME driver has no support for subenclosures (4)" errors are seen during booting. Due to the error messages seen below a kernel parameter rdloaddriver=scsi_dh_rdac was added after which the errors started.

Buffer I/O error on device sdo, logical block 0
sd 4:0:0:1: [sdg] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 4:0:0:1: [sdg] Sense Key : Illegal Request [current] 
sd 4:0:0:1: [sdg] <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1
sd 4:0:0:1: [sdg] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
end_request: I/O error, dev sdg, sector 0
Buffer I/O error on device sdg, logical block 0
sd 4:0:0:0: [sdf] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 4:0:0:0: [sdf] Sense Key : Illegal Request [current] 
sd 4:0:0:0: [sdf] <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1
sd 4:0:0:0: [sdf] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
end_request: I/O error, dev sdf, sector 0
Buffer I/O error on device sdf, logical block 0
sd 3:0:0:1: [sdc] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 6:0:0:0: [sdn] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 6:0:0:0: [sdn] Sense Key : Illegal Request [current] 
sd 6:0:0:0: [sdn] <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1
sd 3:0:0:1: [sdc] Sense Key : Illegal Request [current] 
sd 3:0:0:1: [sdc] 
sd 6:0:0:0: [sdn] CDB: <<vendor>> ASC=0x94 ASCQ=0x1ASC=0x94 ASCQ=0x1
sd 3:0:0:1: [sdc] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
end_request: I/O error, dev sdc, sector 0
Buffer I/O error on device sdc, logical block 0

• I see the following messages after a firmware upgrade on our enclosure:

kernel: sd 3:0:1:0: FIXME driver has no support for subenclosures (4)
kernel: sd 3:0:1:0: Failed to bind enclosure -12
kernel: sd 3:0:1:1: Embedded Enclosure Device
kernel: sd 3:0:1:1: FIXME driver has no support for subenclosures (4)
kernel: sd 3:0:1:1: Failed to bind enclosure -12
kernel: sd 4:0:0:0: Embedded Enclosure Device