Hyperconverged Infrastructure (HCI) combines compute, storage and networking into a software-defined cluster of standardised x86 servers, eliminating the classical three-tier architecture of separate servers, SAN storage and network fabrics. HCI emerged in the early 2010s and has become the dominant on-premises infrastructure for ERP deployments where cloud is not the chosen path. For DACH operations retaining on-premises or private-cloud ERP (SAP S/4HANA on-premises, Microsoft Dynamics 365 F&O on-premises, abas, proALPHA), HCI is the typical underlying infrastructure choice.
HCI architecture
Three-layer abstraction. Hardware layer: standardised x86 servers with local storage (SSD, NVMe), interconnected via 10/25/100 GbE networking. No external SAN. Virtualisation layer: hypervisor (VMware ESXi, Microsoft Hyper-V, Red Hat KVM, Nutanix AHV) plus the HCI software providing distributed storage and network virtualisation. Software pools the node-local storage into a cluster-wide virtual SAN. Management layer: unified management console covering compute, storage, networking, backup and DR. Scaling: add nodes to grow capacity and performance linearly. Compared with classical three-tier infrastructure: simpler operations, faster deployment, easier capacity expansion. Trade-off: scale unit is the node, with combined compute-and-storage growth characteristics not always matching application patterns.
Leading HCI products
Nutanix: market leader, supports multiple hypervisors (ESXi, AHV native, Hyper-V), strong DACH presence. VMware vSAN plus VxRail (Dell): VMware-centric, integrated stack from Dell. HPE SimpliVity: HPE-branded HCI with integrated deduplication and backup. Cisco HyperFlex: Cisco-integrated stack. Microsoft Azure Stack HCI: Hyper-V-based HCI integrating with Azure cloud services for hybrid scenarios. Open source: ProxmoxVE with Ceph storage. For SAP S/4HANA on-premises, all major HCI vendors offer SAP-certified configurations. The choice typically reflects existing infrastructure relationships and hypervisor preference more than meaningful technical differentiation between vendors.
ERP-hosting considerations
HCI is well-suited to ERP workloads in many scenarios. SAP HANA workloads: SAP-certified HCI configurations from Cisco, Dell, HPE, Lenovo and Nutanix support production HANA. Sizing depends on database size; mid-market HANA (1-10 TB) fits comfortably in 4-8 node HCI clusters. Mid-market ERP workloads: Microsoft Dynamics 365 F&O on-premises, abas, proALPHA, Sage X3 on-premises all run well on HCI. Mixed workloads: HCI typically hosts multiple application workloads (ERP, file servers, virtual desktops, departmental applications) on the same cluster, improving resource utilisation. Performance considerations: high-IOPS database workloads benefit from NVMe-only configurations; mixed-workload clusters can use hybrid SSD-NVMe configurations. Production sizing should include 20-30% headroom for performance peaks and growth.
Trends and cloud-relation
Three trends shape HCI's future. (1) Hybrid cloud integration: HCI clusters extending into public cloud (Microsoft Azure Stack HCI to Azure, Nutanix Cloud Clusters to AWS) for elastic capacity and DR. (2) Edge deployments: small HCI clusters at branch offices and production sites, managed centrally. (3) Cloud-native repatriation: some workloads moving from public cloud back to on-premises HCI for cost or sovereignty reasons. For DACH ERP-bearing organisations, the HCI question is increasingly 'HCI or cloud' rather than 'HCI or three-tier'. Classical three-tier (separate compute, SAN, network) is declining for new deployments. The fundamental choice has become deployment model (cloud SaaS, cloud private, on-premises HCI) more than infrastructure topology.
Yes — SAP certifies multiple HCI configurations for HANA production from Cisco, Dell, HPE, Lenovo and Nutanix. For mid-market HANA (database size up to 10 TB), HCI is the typical infrastructure choice. Above 10 TB, dedicated certified appliances or scale-up servers may offer better economics.
Nutanix or VMware vSAN for DACH ERP?
Both are credible. Nutanix tends to be preferred for new deployments wanting to escape VMware licensing complexity (especially after Broadcom acquisition); VMware vSAN remains common where existing VMware investments justify continuity. Test in your specific workload profile rather than relying on benchmark numbers from vendor marketing.
How does HCI compare to public-cloud ERP economics?
Capex versus opex trade-off. HCI requires upfront investment (typically 100,000-500,000 EUR for a mid-market production cluster) plus ongoing operations effort. Cloud ERP shifts to subscription with no upfront infrastructure. Over 5-year TCO, the two typically converge within 10-20%. Cloud's advantage is operational simplicity; HCI's is control and customisation flexibility.
