Beginning with PAN-OS 10.2, the
maximum number of sessions supported
on an individual VM-Series firewall scales with the amount of memory
allocated to the VM-Series instance. Because memory increments are
not locked in place, you can increase the amount of memory as needed
for your environment. For example, if your VM-Series is assigned
16GB of memory (2,000,000 sessions) but you need to support 3,000,000
sessions, you can increase the memory to 24GB instead of having
to jump all the way to 56GB as in previous
PAN-OS releases. Therefore,
in deployments where resources are tight, you no longer need to
statically allocate more memory than necessary to achieve the capacity
you require.