NEC 320Fc - Manual (Page 16)

Overview of the Active Upgrade Process
1-4 Express5800/320Fc Active Upgrade™ User’s Guide
As shown in Figure 1-2 , when you split the system, the Active Upgrade console
disables any Rapid Disk Resync (RDR) mirroring between the internal disks in
each CPU- I
⁄ O enclosure and isolates the Upgrade Side from system resources
such as the network, any user-specified application data disks, and any external
PCI resources. It also disables user-specified applications and services on the
Upgrade Side so they cannot restart if you restart the Upgrade Side.
Meanwhile, the Production Side retains access to system resources and continues
to run your applications uninterrupted.
5. After the system successfully enters split mode, you establish a remote connection
to the Upgrade Side of the system through the private network that exists between
the VTM adapters in each CPU- I
⁄ O enclosure. Using this remote connection, you
can perform any of the following upgrade tasks on the Upgrade Side:
• Run software installation programs (see “Software Upgrade Support” on
page 2-1 for restrictions).
•
Restart the operating system, if necessary.
• Perform limited testing of the installed updates. (The Upgrade Side has no
access to the network or application data disks during this stage.)
You can also completely abort the upgrade from the Active Upgrade console, if
necessary.
6. When you are finished installing software on the Upgrade Side, you disconnect the
remote connection to the Upgrade Side and initiate the merge process.
When you merge the system, the Active Upgrade console stops your applications
on the Production Side and unmounts any application data disks to ensure that
pending disk updates are flushed to disk. It then merges system resources so that
the network and application data disks become available to the whole system
again. With the exception of the internal disks, all critical system resources return
to duplex mode (
Figure 1-3 ).