After you upgrade to a Panorama 8.0 or later
release, Panorama Log Collectors use a new log storage format. Because
Panorama cannot generate reports or ACC data from logs in the pre-8.0-release
log format after you upgrade, you must migrate the existing logs
as soon as you upgrade Panorama and its Log Collectors from a PAN-OS®
7.1 or earlier release to a PAN-OS 8.0 or later release and you
must do this before you upgrade your managed firewalls. Panorama
will continue to collect logs from managed devices during the log
migration but will store the incoming logs in the new log format
after you upgrade to a PAN-OS 8.0 or later release. For this reason,
you will see only partial data in the ACC and in Reports until Panorama completes
the log migration process.
The
amount of time Panorama takes to complete the log migration process
depends on the volume of new logs being written to Panorama and
the size of the log database you are migrating. Because log migration
is a CPU-intensive process, begin the migration during a time when
the logging rate is lower. You can always stop migration during
peak times if you notice that CPU utilization rates are high and
resume the migration when the incoming log rate is lower.