Status: IN
DAX (direct persistent memory mapping) for ext4/XFS requires NVDIMMs and the `dax` mount option (e.g., `mount -o dax /dev/pmem0 /mnt/dax`); it is a Technology Preview in RHEL 9.2.
Source: repo:entries/2026/03/03/en-documentation-red_hat_enterprise_linux-9-html-92_release_notes-technology-pre.md