Selecting the Right Datacenter Design

Tech Tips - By Vincent Chan - 20 Nov 2024 (Wed)

In data center infrastructure design, there are multiple approaches that can be used, depending on the specific needs of the organization. These designs typically include standalone servers for small and medium-sized enterprises (SMEs), traditional infrastructure (often referred to as a 3-Tier Architecture), and Hyper-Converged Infrastructure (HCI). All of these solutions are legitimate and effective, and they offer different ways to meet various IT needs. However, it’s important to note that many organizations are influenced by vendors pushing newer solutions. As end users, it's essential to evaluate and choose the right infrastructure based on the company’s specific needs, rather than simply following trends.

A common question I encounter is whether Hybrid Infrastructure requires HCI. From my perspective, the answer is no. All available infrastructure solutions on the market can support hybrid cloud solutions. In fact, cloud environments and co-location (CO-LO) data centers are quite similar, with only a few differences. I will address this in a separate topic, but it’s important to note that many modern data centers are leveraging iSCSI instead of traditional SAN storage. In my experience, HCI is becoming more prevalent in the majority of data centers I have visited.

When comparing 3-Tier Architecture to HCI, one common question is whether HCI is more cost-effective. From my point of view HCI can be more expensive than 3-Tier Architecture, especially when there is a significant disparity in compute or storage requirements. HCI often operates with a single storage pool, which limits the ability to have multiple physical storage tiers. This contrasts with cloud solutions, where it’s possible to allocate workloads to different storage types, such as performance disks and cold storage. This concept, known as multi-storage tiering, is not as easily achievable with HCI.

That said, there are cases where HCI can be more affordable than 3-Tier Architecture, particularly in scenarios where a fixed compute environment is used and performance disks are required, such as in Virtual Desktop Infrastructure (VDI) solutions. Ultimately, the decision comes down to the specific workloads you plan to run and the required performance.

Another frequently asked question is about the differences between Hyper-Converged Infrastructure (HCI) and Detectable Hyper-Converged Infrastructure (dHCI). The main difference lies in how workloads are distributed across the hardware. In HCI, resources are shared across both compute and storage, meaning that both compute and storage IOPS (Input/Output Operations per Second) are allocated dynamically. Maybe the performance of the workload maybe degraded if didn’t plan properly.



On the other hand, dHCI separates the compute and storage loads. This means that in a dHCI environment, the compute and storage IOPS are dedicated and not dynamically shared. In HCI, enabling features like deduplication and compression can reduce the available storage resources, as these features consume more compute power to provision VMs.



Ultimately, the choice of data center infrastructure design depends on your company’s system requirements. Key factors to consider include software licensing, hardware needs, application performance, high availability, business continuity, and disaster recovery. Each of these factors plays a critical role in determining the best solution for your organization’s needs.