Description of the illustration mig_server1.gif

This graphic contains four boxes, labeled "Machine A," "Machine B," "Machine C," "Machine D," and a database labeled "Lease Table."

Machine A contains a pentagon labeled "Administration Server."

Machine B contains an oval labeled "Node Manager.," a pentagon labeled "Managed Server 1 (Migratable)," and a database. Machine C contains an oval labeled "Node Manager.," a pentagon labeled "Managed Server 2 (Migratable)," and a database. Machine C contains an oval labeled "Node Manager."

Arrows connect the parts as follows:

Arrow 1, "Start Cluster," points to the Administration Server on Machine A. The Administration Server points to the Node Managers on Machine B and Machine C, with arrows 2, "Contact NM." The Administration Server also points to the Managed Servers on Machine B and Machine C, with arrows 4, "Obtain configuration."Each Node Manager points to its associated Managed Server with arrows 3, "Start MS1" and "Start MS2." Each Managed Server points to its associated database, with arrows 5, "Cache config."

Each Managed Server points to the Lease Table with arrows 6, "Obtain migratable server lease and cluster master lease" (from Managed Server 1) and "Obtain migratable server lease" (from Managed Server 2. Each Managed Server also points to the Lease Table with arrows 7, "Renew leases."