Blockstor: a LINSTOR-compatible storage system for Kubernetes, written from scratch in Go

Tue, 04 Aug 2026 00:00:00 +0000

The Cozystack team has open-sourced Blockstor, a control plane for block storage in Kubernetes: LVM and ZFS as backends, replication over DRBD, and a LINSTOR-compatible REST API. The project lives in the cozystack organization and is developed as part of Cozystack, a platform accepted into the CNCF Sandbox. The license is Apache 2.0.

The main thing that makes it worth a look: it is not a fork, and it is not a wrapper. Blockstor is written from scratch in Go, but it speaks the same REST API as LINSTOR — so all the client tooling you already run keeps working without a single change: the linstor CLI, linstor-csi, piraeus-operator, and the golinstor library.

How LINSTOR and DRBD Keep Your Data Alive When a Server Dies

Wed, 22 Jul 2026 00:00:00 +0000

Every bare-metal operator’s nightmare: a disk fails at 3 AM. If your storage is node-local (a local-path or hostPath volume pinned to one node), you’re restoring from backup and praying it’s recent. Ceph gives you replication but demands 3+ dedicated storage nodes, a PhD in CRUSH maps, and constant tuning. Most teams either over-invest in storage infrastructure or under-invest and pay the price in outages.

Linstor on Cozystack

Blockstor: a LINSTOR-compatible storage system for Kubernetes, written from scratch in Go

How LINSTOR and DRBD Keep Your Data Alive When a Server Dies