Documentation states we support filesystems mounted to /var. We do not really support this, since it impacts the Kubelet's ability to GC images and calculate usage drive space. Kubelet looks at the root (/) filesystem to calculate disk usage, and so evictions, gc images, and other services are not accurate with disks mounted to /var.

There is a feature in the works called Split filesystems (upstream), but it is not close to being done.    

The current docs are accurate on how to mount disks to /var, but we need to change the docs to call out this limitation and state we do not recommend disks mounted to /var.

    All, but likely most important in 4.16 and newer.

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https://access.redhat.com/articles/4766521

https://docs.redhat.com/en/documentation/openshift_container_platform/4.17/html/installing_on_bare_metal/installing-bare-metal#installation-user-infra-machines-advanced_vardisk_installing-bare-metal