The size of the ignition.img image in the live ISO is 256KB.

Calico Enterprise requires enormous manifests to install - around 2.25MB worth, which in an unscientific test still came to about 550KB when base64-encoded and gzipped. There is an open source version of Calico that is smaller, and it is possible to upgrade to Calico Enterprise from that, but Tigera does not support that in production. Since Calico is used as the SDN for the cluster, it must be installed on Day 1.

In order to make the live ISO usable (both in the agent-based installer and potentially in future for metal IPI via METAL-156) for deployments that include Calico Enterprise, it would be useful if the size of the Ignition embed area were increased to 1MB or more.