Longhorn Alternative
Improve system stability and optimize throughput and latency with Simplyblock
Simplyblock's NVMe-First architecture enables superior performance and system stability, while significantly reducing storage costs through intelligent thin provisioning and automated tiering to S3. Simplyblock as your alternative provides the best features of Longhorn with the stability and reliability required by enterprise use cases.
Challenges with Longhorn
Performance Bottlenecks
Longhorn users report limitations in I/O performance, especially under heavy workloads. These issues can arise due to the way Longhorn handles I/O operations, sometimes relying on a single CPU core for managing multiple I/O queues, which can slow down operations.
Backup and Restore Issues
Large volume backups can be problematic, sometimes leading to backup failures or requiring extensive time to complete. For instance, backups of large volumes (70 GB or more) have been reported to fail frequently, causing replicas to enter degraded states and forcing time-consuming rebuilds.
Replica / State Management
Longhorn relies on replicas for data redundancy, but network issues or high CPU loads can cause replicas to degrade or fail to rebuild properly. These failures can be triggered by insufficient resources or network instability, leading to incomplete or stalled data replication.
Resource Consumption
Longhorn's architecture is resource-intensive regarding CPU and network bandwidth. CPU and memory overhead increases with the volume of concurrent read/write operations. Managing this overhead can require careful tuning of cluster resources.
What is Simplyblock?
Transform your storage infrastructure with simplyblock's enterprise-grade solution, enabling easier deployment, simplified management, and increased performance over Longhorn, with built-in thin provisioning, intelligent tiering, and NVMe-first architecture. Unlike Longhorn's resource-intensive single-controller design, simplyblock's unified storage plane provides seamless scalability, automated storage optimization, and consistent performance—making storage bottlenecks, degraded volumes, and backup failures a thing of the past.
Deployment comparison
Simplyblock and Longhorn integrate seamlessly with Kubernetes via their Container Storage Interface (CSI) drivers. Additionally, both solutions enable thin provisioned logical volumes, snapshotting, and cloning.
Simplyblock, however, provides additional enterprise features like automated storage tiering to S3, and intelligent volume placement out of the box.
Longhorn relies on iSCSI for connectivity. While Longhorn's version 2 of the storage engine supports NVMe over TCP, this engine is still experimental and not recommended for production use. Simplyblock, however, leverages the more modern NVMe over TCP protocol as it's core technology, which provides better performance and comes built into modern Linux kernels without requiring additional drivers.
With simplyblock as your alternative to Longhorn, you get higher performance, lower latency, and lower protocol overhead - just like that.
Architecture comparison
Simplyblock is designed for low resource utilization, minimal performance impact (over bare metal), and little storage overhead due to data copy reduction with erasure coding.
Contrary, Longhorn creates a dedicated storage controller for each volume and synchronously replicates data across multiple replicas. This fundamental architectural difference means Longhorn requires more individual controllers to manage, while simplyblock's approach enables more efficient resource utilization and simplified management.
Additionally, simplyblock offers flexible deployment options, supporting disaggregated (storage runs in dedicated cluster), hyperconverged (storage and workloads share Kubernetes worker nodes), and hybrid models. This allows optimizing for performance with local NVMe in hyperconverged mode, independent scaling with disaggregated, or a balance in hybrid deployments.
Benefits of Simplyblock?
Simplyblock improves performance, resource efficiency, and eliminates Longhorn's backup-restore issues.
Superior Performance Architecture
With its three deployment options, simplyblock provides the best setup for any use case, no matter if you require lowest latency, highest throughput, or maximum scalability. With its NVMe-First architecture, simplyblock got you covered.
Efficient Resource Utilization
Simplyblock's unified storage plane architecture requires fewer system resources compared to Longhorn's per-volume controller design. Additionally, intelligent tiering auto-moves cold data to S3, reducing expensive block storage usage.
Enterprise-Grade Data Protection
Simplyblock uses copy-on-write snapshots which don't impact performance, unlike Longhorn's snapshot chains. Furthermore, simplyblock provides seamless backup streaming to S3 to eliminate the volume degradation issues Longhorn experiences with large backups and enable near-zero RPO disaster recovery.
Questions and Answers
How does simplyblock compare to Longhorn for Kubernetes storage?
Longhorn is an open-source, Kubernetes-native block storage system from SUSE that uses a per-volume controller with synchronous replication over iSCSI; its v2 NVMe/TCP engine is still maturing. Simplyblock is built on NVMe/TCP and SPDK from the ground up, delivering sub-200-microsecond latency, a unified storage plane instead of one controller per volume, erasure coding for roughly 1.25x overhead versus 3x replication, and per-PVC QoS. Simplyblock includes commercial support and automated tiering to object storage.
What changes are required to migrate from Longhorn to simplyblock?
Simplyblock installs as a separate StorageClass through its CSI driver alongside existing Longhorn volumes. New PVCs land on simplyblock while current workloads keep running on Longhorn. Databases migrate with standard backup and restore, and block volumes migrate by quiescing writes, taking a snapshot, restoring to a simplyblock volume, and repointing the workload. Most teams migrate incrementally by workload type, avoiding Longhorn's large-volume backup-restore bottlenecks during the transition.
When is simplyblock a better fit than Longhorn?
Simplyblock fits better when Longhorn's per-volume controllers and replica rebuilds cause performance bottlenecks or backup failures under load. It is stronger when you need consistent low latency, higher IOPS density per core, storage efficiency from erasure coding rather than 3x replication, guaranteed per-PVC QoS, and commercial support with SLAs. Teams running large volumes or latency-sensitive databases on Longhorn benefit the most.
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Longhorn and all other product names, logos, and brands are property of their respective owners and are used for identification purposes only. Use of these names does not imply endorsement or affiliation. Comparisons are based on publicly available information at the time of publication and may not reflect the most recent product changes. Verify current capabilities with each vendor before making purchasing decisions.