vSAN Component Limit per Cluster

Products

• VMware vSAN

Issue/Introduction

vSAN objects and components

vSAN stores and manages data in the form of flexible data containers called objects. An object is a logical volume that has its data and metadata distributed across the cluster. For example, every VMDK is an object, as is every snapshot. Each vSAN object is composed of a set of components, determined by capabilities that are in use in the VM Storage Policy. When you provision a virtual machine on a vSAN datastore, vSAN creates a set of objects comprised of multiple components for each virtual disk.

You can find the total number of vSAN components in use from Cluster > Monitor > vSAN Health Service > Capacity Utilization > Component
Or in later versions of vSphere from Cluster > Monitor > Skyline Health > Capacity utilization > Component

Resolution

"The maximum number of components per cluster is determined by multiplying the maximum number of components allowed per host (9,000) by the number of hosts in the cluster. Additionally, vSAN provides a recommended maximum component limit per cluster. For vSAN OSA clusters, the current recommended limit is 288,000 components, and exceeding this limit is not advised.

For vSAN ESA clusters, the maximum number of components per host is 27,000."