Answer:

Use the command sm_tpmgr to recover information on devices that were not discovered. For example:

sm_tpmgr -s INCHARGE-AM --status
Last Status Message: Last discovery completed at 24-Jan-2011 11:48:36 AM EST
Discovery Queue Size: 0
Discovery Pending List:
Host-abc [community='',reason='No response from SNMP agent, AUTODETECT, SNMP-E-ERESPONSE-No response from 10.29.12.1, port 161
SNMP-ETIMEOUT-Timed out']
B9230558D [community='',reason='No response from SNMP agent, AUTODETECT, SNMP-E-ERESPONSE-No response from 10.29.5.129, port 161
SNMP-ETIMEOUT-Timed out']