VMware Cloud Foundation 4.5

5.2 5.1 5.0 4.5
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Sizing Considerations for ESXi for

You decide on the number of ESXi hosts per cluster and the number of physical disks per ESXi host.
For detailed sizing based on the overall profile of the
instance you plan to deploy, see VMware Cloud Foundation プランニングおよび準備ワークブック.
The configuration and assembly process for each system should be standardized, with all components installed in the same manner on each ESXi host. Because standardization of the physical configuration of the ESXi hosts removes variability, the infrastructure is easily managed and supported. ESXi hosts are deployed with identical configuration across all cluster members, including storage and networking configurations. For example, consistent PCIe card slot placement, especially for network interface controllers, is essential for accurate mapping of physical network interface controllers to virtual network resources. By using identical configurations, you have an even balance of virtual machine storage components across storage and compute resources.
ESXi Server Sizing Considerations by Hardware Element
Hardware Element
Considerations
CPU
  • Total CPU requirements for the workloads that are running in the cluster.
  • Host failure and maintenance scenarios.
    Keep the overcommitment ratio vCPU-to-pCPU less than or equal to 2:1 for the management domain and less than or equal to 8:1 for VI workload domains .
  • Additional third-party management components.
  • Number of physical cores, not logical cores. Simultaneous multithreading (SMT) technologies in CPUs, such as hyper-threading in Intel CPUs, improve CPU performance by allowing multiple threads to run in parallel on the same CPU core. Although a single CPU core can be viewed as two logical cores, the performance enhancement will not be equivalent to 100% more CPU power. It will also differ from one environment to another.
Memory
  • Total memory requirements for the workloads that are running in the cluster.
  • When sizing memory for the ESXi hosts in a cluster, to reserve the resources of one host for failover or maintenance, set the admission control setting to N+1, which reserves the resources of one host for failover or maintenance.
  • vSAN OSA. Number of vSAN disk groups and disks on an ESXi host.
    To support the maximum number of disk groups, you must provide 32 GB of RAM. For more information about disk groups, including design and sizing guidance, see VMware vSAN の管理 in the vSphere documentation.
  • vSAN ESA. You must provide 512 GB of RAM.
Storage
  • Use high-endurance device such as a hard drive or SSD for boot device
  • Use 128-GB boot device to maximize the space available for ESX-OS Data
  • vSAN OSA
    • Provide at least one 600-GB cache disk.
    • Use a minimum of two capacity disks.
  • vSAN ESA. Use a minimum of two NVME devices.
  • Use hosts with homogeneous configuration.

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