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During offline upgrade, a temporary IMSVA device is used to process email traffic. IMSVA logs all information and does not experience any downtime during the upgrade process.
Tip
Tip
Trend Micro recommends performing offline upgrade when mail traffic is at a minimum. Evaluate if the temporary IMSVA device can accommodate the total mail traffic during the upgrade process.
When using offline upgrade:
  1. Back up your files before deploying IMSVA to virtual machines.
  2. Use an NTP server to ensure that the production IMSVA devices and the temporary IMSVA device use the same system time.
The following is an overview of the offline upgrade process:
offline-upgrade.jpg
  1. Install IMSVA 9.1 on a temporary device.
  2. Import the configuration settings from the production IMSVA devices.
  3. Modify the DNS MX record to redirect mail traffic to the temporary device.
  4. Disconnect the production devices from the network.
  5. Upgrade the devices.
  6. Redirect mail traffic back to the production devices.
  7. Copy the logs and queue folders from the temporary device to one of the production child devices.
Note
Note
Data gaps may occur after restoring the data to the child devices. If Virtual Analyzer notifications are enabled, you may receive Virtual Analyzer service messages after data is restored.
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