NEC Express5800/320Fd-LR User Manual page 311

maintenance network.
•
Can tolerate running in simplex mode for a brief period during the upgrade.
Because each side of the system runs in simplex mode during the upgrade, an interruption on
the side that is actively running your critical applications can result in downtime.
IMPORTANT:
You cannot restart the operating system on the Production Side during an upgrade (though
you can restart the Upgrade Side as many times as necessary.) Also, it is unsafe to pull an
enclosure from a split-mode, simplexed system because doing so terminates all processes
running on that enclosure.
•
Can tolerate a potential decrease in performance during the upgrade.
For example, if your system contains teamed network adapters that are configured for load
balancing or link aggregation, there might be a decrease in network performance when the
system is split because the network adapters on the Upgrade Side lose access to the network.
•
Have been updated with the latest firmware to support Active Upgrades, including required
BMC updates.
Furthermore, the Active Upgrade process has the following storage requirements:
•
All internal hard disks must be configured with Rapid Disk Resync (RDR) and must be
duplexed (synchronized) before the Active Upgrade process starts.
•
The operating system boot volume and all active Windows operating system components must
be located on internal RDR disks. This includes any volumes that contain paging (virtual
memory) files for the operating system.
•
Any disk that contains software you want to upgrade cannot contain persistent data files for
your business-critical applications (those applications that will continue to run during the
Active Upgrade process). You must store your data files on separate data disks, either internal
or external. (Data volumes that reside on the same physical disk as a system or paging volume
are also not supported.)
•
External storage devices are always considered data disks. You cannot upgrade software on
external storage devices, as these devices not available to the Upgrade Side of the system while
the system is in split mode.
TIPS:
Overview, page 5-82
Software Upgrade Support, page 5-90
Recommendations, page 5-94
Managing Critical Applications During the Upgrade Process, page 5-95
Pre-Upgrade Tasks, page 5-96
Installing and Using Utilities 5-93