Error Message

In Operations Manager, a host is uniquely identified using hostguid. The hostguid is generated using MAC address. So if the MAC address of a host changes the hostguid for that host also changes. In the current mechanism of Operations Manager, when a hostguid change is detected for a physical host, the host goes into Disconnected State and a fault is generated for the host saying "Host is disconnected; probable cause is host has been reinstalled". For virtual hosts the above fault is generated when their biosuuid is changed along with the hostguid. User needs to remove and re‐add host to M‐S to start managing the host again. However the above fault causes confusion to user because host has not been actually reinstalled.

With Operations Manager 7.0 onwards, a proper fault is raised if the hostguid is changed because of a change in the MAC address of the host. The host Overview page under Server Perspective displays fault stating that “Host is disconnected, probable cause is change in MAC address. Changes post this condition are not reflected on Operations Manager Management Server. Please remove and re‐add this host to Management Server to correct this.” As a result, the user is asked to remove the host from the domain, and again add it to the domain to resolve this issue.