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Installation upgrade
System reliability
Automatic backup
Power failure
7
Switch from Precutover Mode to Product Mode.
The following is a list of the steps required to perform a NAC 2 installation
upgrade.
1
Back up the system database from your existing system.
2
Install the operating system and the NAC application software
(customer-installed software).
3
Transfer the existing customer database to the NAC hard disk.
4
Start up the NAC system in Precutover Mode.
5
Adjust the database while in Precutover Mode.
6
Switch from Precutover Mode to Product Mode.
To minimize the loss of recent changes to the system's database in the event
of a disk failure, database files are backed up to tape every midnight. If the
cassette tape is not rotated daily, each time the midnight routine runs, the
new backup overwrites the previous one. For this reason, several backup
tapes should be used.
Data used by the NAC's displays and reports is stored in the Meridian
MAX nodes that generated the original data. Historical data is backed up at
the node, through the Meridian MAX automatic backup facility.
For more information on the Meridian MAX's capacity to store data, refer
to either the Meridian MAX 4 Installation Guide (NTP 553-4001-111) or
the Meridian MAX 6 Installation Guide (NTP 553-4001-111), depending
upon the release of Meridian MAX software.
If a power failure occurs, NAC automatically reboots and initializes the
application software as soon as power is reapplied.
AC/DC supply
If you have the DC version of NAC you may have also acquired the battery
backup option. This option allows you to connect your NAC to a battery. In
the event of a power failure, such a system can be brought down safely
Network Administration Center (NAC) Installation Guide Product release 2
Introduction 1-5
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