NEC Express5800/R320c-E4 N8800-173F Installation Manual page 217

Chapter 2 Installing Bundled Software
(d) Aborting the Active Upgrade Process
If you abort the upgrade session while the system is in split mode, no downtime is incurred. Your applications
continue to run on the Production Side while the Active Upgrade Console restores the system to duplex mode.
If you abort the upgrade session while the system is in merge mode, a short period of downtime is incurred while
the Active Upgrade Console initiates a system restart. The Active Upgrade Console shuts down the Upgrade
Side and restarts the system from the Production Side, which automatically restarts your applications from the
Production Side. The period of downtime is only as long as it takes your system and applications to restart.
In either case, the abort process uses RDR resynchronization to restore the internal disks to their original state
by overwriting the Upgrade Side system disk and stale Upgrade Side data disks with their original partner disks
(see the figure below).
Console
After you abort the Active Upgrade process, you can start another Active Upgrade session as soon as the RDR
disk resynchronization is complete.
Express5800/R320c-E4, R320c-M4, R320d-E4, R320d-M4 Installation Guide (Windows)
Important You can abort the Active Upgrade process and restore the system to its original
state before committing the upgrade. You cannot abort the upgrade process after
you commit an upgrade.
Duplexed system
Network External
storage
Aborting the Upgrade
1. Bundled Software for the Server
Internal storage
Data
System
(Old system)
(Current data)
Re-mirroring
by RDR
System Data
(Upgraded system)
(Old data)
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