Hyper-Converged Storage
Terms related to simplyblock
Hyper-converged storage is a system architecture where compute, storage, and networking are tightly integrated within the same physical node, typically managed through a unified software layer. Each node contains a portion of both compute and storage resources, and multiple nodes are clustered to form a single, scalable platform. This is the foundation of hyper-converged infrastructure (HCI).
The primary goal of hyper-converged storage is simplicity: deploying storage as part of a virtualized compute infrastructure using commodity hardware and eliminating the need for separate storage arrays or SANs. While HCI platforms are widely adopted in traditional virtualized environments like VMware or Hyper-V, they often lack the elasticity and efficiency needed for cloud-native and Kubernetes workloads.
How Hyper-Converged Storage Works
Each node in an HCI cluster contributes compute (CPU/RAM) and storage (usually SSD or HDD). Data is distributed across nodes, often with full replication for availability. The cluster appears as a single storage pool managed through a central interface, abstracting underlying complexity.
Popular HCI vendors include Nutanix, VMware vSAN, and Scale Computing. These platforms typically rely on virtualization for resource pooling and use replication (rather than erasure coding) for fault tolerance, which can lead to higher storage overhead.
Unlike disaggregated storage, hyper-converged systems do not allow independent scaling of compute and storage—leading to inefficiencies in multi-tenant or storage-heavy environments.
Hyper-Converged vs Disaggregated vs Traditional Storage
| Feature | Hyper-Converged Storage | Disaggregated Storage | Traditional SAN |
|---|---|---|---|
| Compute & Storage Coupling | Tightly coupled | Fully decoupled | External to compute nodes |
| Scalability | Node-based (joint scaling) | Independent for each layer | Limited by controller pairs |
| Resource Efficiency | Risk of overprovisioning | High | Moderate |
| Fault Tolerance | Node-level replication | Adaptive, cluster-aware | Dual controller failover |
| Kubernetes Integration | Partial | Native via CSI | Complex |
| Cost Over Time | High with growth | Predictable and modular | Expensive initial CapEx |
Benefits of Hyper-Converged Storage
Hyper-converged platforms are best suited for environments prioritizing ease of deployment and management over elastic scalability. Benefits include:
- Simplified operations: One interface to manage compute and storage.
- Quick provisioning: Turnkey deployments using pre-configured nodes.
- Integrated virtualization: Optimized for VMs via platforms like vSphere or Hyper-V.
- Reduced vendor sprawl: Fewer systems and fewer management silos.
However, organizations with fast-growing, storage-heavy, or Kubernetes-native workloads may find hyper-converged systems limiting, especially in terms of independent scaling and cost optimization.
Limitations of Hyper-Converged Storage
Despite its simplicity, hyper-converged storage has inherent architectural constraints:
- No independent scaling: You can’t add storage without also adding compute.
- High replication overhead: Typically 2x or 3x raw capacity for resilience.
- Not optimized for microservices: Limited support for Kubernetes storage patterns like CSI-based dynamic provisioning or multi-tenant isolation.
- Less suited for hybrid cloud: Inflexible when integrating with cloud-native stacks or air-gapped edge deployments.
Hyper-Converged vs Simplyblock™
Simplyblock is architected as a disaggregated, modular, and shared-everything platform—a fundamental departure from hyper-converged models. It enables:
- Independent scaling of storage and compute
- Sub-millisecond latency using NVMe-over-TCP
- Advanced erasure coding to avoid the capacity waste of replication
- Seamless integration with Kubernetes, OpenShift, and Proxmox VE
- Native multi-tenancy and QoS for platform teams and DBaaS providers
Where hyper-converged hits a scaling wall, simplyblock scales dynamically, across cloud, edge, or bare-metal.
Use Cases for Hyper-Converged Storage
HCI is often deployed in environments where virtual machines remain the dominant workload and simplified management outweighs scale flexibility:
- Remote offices or branch locations (ROBO)
- Private clouds based on VMware vSphere
- Backup and disaster recovery platforms
- SMBs and legacy datacenters
- VDI (Virtual Desktop Infrastructure) deployments
For dynamic, containerized, or data-intensive workloads, however, many are transitioning to disaggregated and software-defined platforms like simplyblock.
External Resources
- What is Hyper-Converged Infrastructure – Nutanix
- Hyper-Converged vs Disaggregated Infrastructure – GigaOm
- Understanding HCI Architectures – Red Hat
- Storage Scaling in Kubernetes – Kubernetes CSI Docs
Questions and Answers
Hyper-converged storage integrates compute, storage, and networking into a single system, simplifying infrastructure management. It’s ideal for private clouds and edge environments where ease of deployment and unified scaling are key.
Hyper-converged systems tightly couple storage with compute, while disaggregated storage separates them. Disaggregation offers more flexibility and independent scalability—especially valuable in Kubernetes and multi-tenant architectures.
While hyper-converged infrastructure can run Kubernetes, it’s often less flexible than using Kubernetes-native storage. HCI works best in static VM environments, while dynamic workloads benefit more from disaggregated, software-defined options.
Most HCI platforms offer built-in encryption, but adding volume-level encryption provides stronger isolation—especially in shared environments or when regulatory compliance is required.
HCI simplifies operations but can limit scaling flexibility. You must add both compute and storage together, which may lead to over-provisioning. In contrast, software-defined storage offers granular, independent scaling and broader hardware compatibility.