linux

LUKS on NVMe: From 40 GiB/s to 4, Then Back to 20 GiB/s

Monday, August 18, 2025

Note: This testing described in this post was done over a year ago. It might be that things changed since then. At work, we recently upgraded our PostgreSQL servers. This time, however, we encountered an unexpected roadblock when attempting to enable full disk encryption (FDE) with LUKS - our standard deployment. In past benchmarks, enabling LUKS full-disk encryption cost us ~10%. This time, it left us with only 10% of our throughput - a 90% drop.

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Backing up you VM with borg

Sunday, March 21, 2021

Recently, for no specific reason at all I did a review of my backup plans of my tiny personal VM:s I have. As my disaster recover plan was mostly “I hope they don’t lose it all at once” I decided to upgrade it to “I have some backups, so I don’t lose it all at once”. To keep things simple and as I love micro optimising to see for how cheap I can get my personal VM’s, I decided to use my home NAS for backups instead of just paying for third-party storage like B2.

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