https://mullvad.net/en/blog/2023/9/20/we-have-successfully-completed-our-migration-to-ram-only-vpn-infrastructure/

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We have successfully completed our migration to RAM-only VPN
infrastructure

20 September 2023  NEWS SYSTEM TRANSPARENCY

Today we announce that we have completely removed all traces of disks
being used by our VPN infrastructure!

In early 2022 we announced the beginning of our migration to using
diskless infrastructure with our bootloader known as "stboot".

Completing the transition to diskless infrastructure

Our VPN infrastructure has since been audited with this configuration
twice (2023, 2022), and all future audits of our VPN servers will
focus solely on RAM-only deployments.

All of our VPN servers continue to use our custom and extensively
slimmed down Linux kernel, where we follow the mainline branch of
kernel development. This has allowed us to pull in the latest version
so that we can stay up to date with new features and performance
improvements, as well as tune and completely remove unnecessary bloat
in the kernel.

The result is that the operating system that we boot, prior to being
deployed weighs in at just over 200MB. When servers are rebooted or
provisioned for the first time, we can be safe in the knowledge that
we get a freshly built kernel, no traces of any log files, and a
fully patched OS.

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