LINBIT DRBD

LINBIT DRBD is open-source distributed replicated block-storage software for Linux, built to mirror writes between peer nodes. It suits teams running high-availability storage that want control over replication and transport; its main trade-off is the operational demands of managing storage at the block and cluster level.

Overview

DRBD’s kernel driver mirrors writes to one or more peers. In synchronous mode, a write is confirmed only after both local and peer storage completion events, a useful fit when the application must wait for replicated data to reach storage. Reads can be served locally without network traffic, and the data path avoids user-space components.

The software combines a kernel driver with user-space management applications and shell scripts. Its command-line interface can manage large clusters independently of cloud, virtualization or container platforms. That independence offers flexibility, but also makes DRBD a more infrastructure-focused choice than a storage service managed entirely through another platform.

Key features

• Replication: Continuous block-level replication supports synchronous and other replication modes, with failover orchestration and multi-site replication.
• Transport: TCP/IP and RDMA/Verbs are supported, including InfiniBand, iWARP and RoCE use cases. That range can suit networks built for low-latency or high-throughput storage traffic.
• Encryption: The DRBD 9 guide documents TLS traffic encryption for TCP transport. Connection authentication and encryption are configured through tlshd, with keys in /etc/tlshd.conf.
• Platform reach: DRBD is primarily Linux software. LINBIT also provides WinDRBD, a Windows driver with precompiled and signed packages, and says its subscriptions integrate with Kubernetes and other major platforms and environments.

Pricing

The community version costs free and includes DRBD 9 source code, documentation and technical guides, plus community support. It is the straightforward starting point for users able to rely on community help rather than a support SLA.

LINBIT Starter costs $1,000 a year, with pricing starting from $1,000 /2 nodes/year. It adds official repositories and the latest software updates to DRBD 9, while support remains community-based and non-SLA. That makes it a paid route to official software distribution and updates, not a substitute for guaranteed response times.

The HA subscriptions are priced per node per year, with custom pricing. LINBIT HA Basic includes business-hour SLA support, five tickets per year and device sizes up to 8TB. It fits deployments that need a defined support commitment but can stay within those limits. LINBIT HA Plus raises device size to 32TB and includes unlimited support tickets, remote installation and troubleshooting, making it better suited to teams that need more support involvement. LINBIT HA Enterprise has unlimited device size, 24x7 email and phone support, and a maximum one-hour initial response for emergencies. Its broader coverage is aimed at deployments where support availability and device capacity are priorities.

Platforms

DRBD targets Linux and self-hosted deployments, with Windows support through WinDRBD. LINBIT’s subscriptions also integrate with Kubernetes and other major platforms and environments. The command-line management option is particularly relevant to teams that want to manage clusters without depending on a cloud, virtualization or container platform.

Who it's for

DRBD is best suited to infrastructure teams building high-availability storage around replicated block devices, especially when local reads, synchronous replication or choice of network transport matter. Its independent cluster management can work well for teams with varied environments. It is a poorer fit for readers seeking a consumer-facing app or a managed storage product that removes the need to operate replication infrastructure.

Pros and cons

• Pros: Local reads avoid network traffic, while the kernel-level data path avoids user-space components. Synchronous replication, multiple transport choices and multi-site support give infrastructure teams meaningful control over how storage is replicated.
• Pros: The free community version provides DRBD 9 source code and technical documentation, and Starter adds official repositories and updates for a clear annual price.
• Cons: HA support is priced per node per year, so cost depends on deployment size; Basic and Plus also impose device-size ceilings.
• Cons: Community support has no SLA on Starter, while Basic is capped at five tickets annually. Teams needing broader coverage must weigh the custom-priced tiers.

Alternatives

OpenEBS is a free, open-source option centered on Kubernetes storage, so it is worth considering when that focus matters more than DRBD’s standalone cluster management and transport choices. Longhorn is another free, open-source distributed block storage option for Kubernetes.

SeaweedFS offers a free community-support plan for any cluster size, with public documentation and no guaranteed response time; consider it if that community model and its supported platforms fit better. NetApp Replication is a free-plan alternative with web platform support.

Cristie CloneManager charges $150, paid once migration and may suit a migration-specific need rather than ongoing replicated block storage. Zerto and Obstor are also alternatives to consider; JetStream DR is another option.

Compare more options in Storage Replication Software.

Verdict

Choose LINBIT DRBD if you need self-managed, high-availability block replication with local reads and the freedom to select TCP/IP or RDMA/Verbs transports. Its free community version and paid Starter tier provide a clear entry point, but teams that need guaranteed support should compare the per-node HA tiers against their device sizes, ticket needs and response-time requirements. Look elsewhere if you want storage without the operational responsibility of running replication infrastructure.