I was on the phone with Dell VMWare support last night and they answered my question. The following restarts all the management services and worked for us. /sbin/services.sh restart
We've loaded OMSA 7.1 for ESXi on our VMWare hosts.  We login using OpenManage on another machine and "Manage Remote Node". OMSA on the VMWare host stops responding every so often, but always comes back with a reboot of the host.  I think it may be the tomcat server because Dell OM Essentials still seems to pick up SNMP messages. I don't want to reboot the entire host to get OMSA to run again. Anyone know how to check if the OMSA services are running on the host, and how to restart the ones that have failed? Thank you.
Restarting OMSA 7.1 on ESXi 5.1