https://rolandsdev.blog/tags/garage/Garage - Tag - Roland's Dev BlogHugo -- gohugo.ioenSat, 17 Oct 2026 17:30:00 +0900https://rolandsdev.blog/posts/reclaim-deleted-disk-space-with-fstrim-in-longhorn/Sat, 17 Oct 2026 17:30:00 +0900rolandjitsuhttps://github.com/rolandjitsurolandjitsu@gmail.comhttps://rolandsdev.blog/posts/reclaim-deleted-disk-space-with-fstrim-in-longhorn/For the past month or so I’ve been rolling out a scalable, high-throughput OCI registry for our CI: Harbor as the registry, Garage as the S3 storage behind it, on Kubernetes with Longhorn providing the volumes (that has since changed, but it’s the setup this story happened on). That journey is worth a few posts on its own (and I plan to write them, at some point), but this one is about a single thing that caught me off guard on a Saturday morning: deleting data does not free disk space. Not on Longhorn, and not on most thin-provisioned storage - until something explicitly tells the layer below which blocks are no longer in use.

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