NEC 320Fc - Manual (Page 20)

Overview of the Active Upgrade Process
1-8 Express5800/320Fc: Active Upgrade™ User’s Guide
Active Upgrade State Model
The state model in Figure 1-6 shows all of the possible Active Upgrade states, and the
order in which they occur during the Active Upgrade process.
Figure 1-6. Active Upgrade State Model
The state model helps to demonstrate the sequence of events in the Active Upgrade
process, as follows:
1. All upgrade sessions start in the Idle state, where you can run the readiness check
as many times as necessary to verify that your system meets the prerequisites of
the upgrade process. The system continues to run normally, and both sides of the
system continue to be synchronized.
2. When you start an upgrade session, the Active Upgrade console switches to the
PrepareSplit state, during which it runs a final readiness check and additional
background tasks. If the system is ready, the console immediately switches to the
Split state and proceeds to divide the system into two independently running
systems.
Commit
Abort
Abort
Abort Abort
Abort
Finish
Finish
Idle
Execute
Merge
Prepare
Merge
Execute
Split
Prepare
Split
Prepare
Split
Readiness
Split Mode
Merge
Prepare
Merge
Split
Commit
Finish
Idle
Check
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