vSAN is supported with hosts that have a single CPU. The use of vSAN space efficiency features such as deduplication and compression and vSAN data encryption services can increase CPU utilization - the amount will vary depending on data services selected, and load. vSAN typically uses less than 10% of CPU resources on a host. Processors in the VMware Compatibility Guide for Systems/Servers must be used in supported configurations. What are the processor requirements for vSAN hosts? More information can be found in Understanding vSAN 6.x memory consumption (2113954). Higher amounts of RAM are recommended depending on application requirements, VM-to-host consolidation ratio goals, and other factors. Hosts participating in a vSAN cluster should be configured with a minimum of 32GB of RAM. How much memory is required in a vSAN host? How many 2-node deployments can share a witness appliance? With vSAN 7 U1 and later, a single witness appliances can support up to 64 2-node deployments Note:Witness appliance cannot be shared in a stretched cluster architecture. vSAN 7 U1 and later allow witness appliances to be shared across multiple 2-node sites. Until vSAN 7, Each 2-node deployment required a dedicated witness appliance. Can a witness appliance be shared across multiple deployments? The witness virtual appliance is a pre-configured virtual machine (VM) running vSphere. This virtual appliance is easily deployed using an OVA file provided by VMware. In certain implementation scenarios such as a vSAN stretched cluster and 2-node configurations, the deployment of a “witness host virtual appliance” is required to provide resilience against "split-brain" scenarios. vSAN is enabled in a matter of minutes with just a few mouse clicks in the vSphere Web Client.
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There is no need to install additional software or deploy “storage controller virtual appliances” to every host in the cluster as commonly found in other hyper-converged infrastructure (HCI) solutions. vCenter Server is required to configure and manage a vSAN cluster. VSAN is natively embedded in the VMware vSphere® Hypervisor. What are the software requirements for running vSAN? All components should be validated using the VMware Compatibility Guide for vSAN. The vSAN Hardware Quick Reference Guide provides some sample server configurations as directional guidance. Simple deployment enables customers to be up and running in as little as 15 minutes.Ĭustom configurations using jointly validated components from all the major OEM vendors are also an option.
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Turn-key appliances such as Dell EMC VxRail™, Hitachi UCP HC, and Lenovo ThinkAgile VX Series provide a fully integrated VMware hyper-converged solution for a variety of applications and workloads. Each ReadyNode is optimally configured for vSAN with the required amount of CPU, memory, network, I/O controllers, and storage devices. Organizations can continue to use their server vendor(s) of choice. vSAN ReadyNodes provide an open, flexible approach when considering deployment methods. The following blog discusses the factors to consider while deciding the size of a cluster, vSAN Clusters – Considerations when Sizing and ScalingĪ vSAN ReadyNode™ is an x86 server, available from all the leading server vendors, which is pre-configured, tested, and certified for vSAN. With vSAN 7 U2 and later, a stretched cluster can have up to 40 physical hosts (20 at each site). vSAN 2-node configurations have two physical hosts. Multiple clusters can be managed by a single VMware vCenter Server™ instance. All-flash configurations are more commonly deployed to take advantage of flash drive performance and reliability.Ī vSAN cluster supports any number of physical hosts from two up to a maximum of 64 hosts in a cluster. A cluster with hosts containing flash devices in the capacity tier is referred to as an “all-flash” cluster or configuration. A vSAN cluster containing hosts with magnetic drives in the capacity tier is commonly called a “hybrid” cluster or configuration.
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VMware cannot provide support for environments running on non-certified hardware.Ī vSAN cluster must have at least two physical hosts with local storage devices dedicated to vSAN. The behavior of non-certified hardware cannot be predicted. Using hardware that is not certified may lead to performance issues and/or data loss. VSAN requires at least two physical servers configured with hardware that is in the VMware Compatibility Guide for Systems/Servers and VMware Compatibility Guide for vSAN. What are the hardware requirements for running vSAN?