When running Messaging Gateway on the DVT 450 hardware platform, SNMP trap events are not sent for changes in RAID or disk status. RAID and disk status is accessible via an SNMP "get" for the appropriate OID.
The snmptrapd listener does not record the RAID / disk event and so no trap message is sent.
This is a known issue for SMG 10.7.0 on the DVT 450 hardware platform and will be addressed with a future release.