How to calculate the vSAN datastore Total Capacity

Products

• VMware vSAN

Issue/Introduction

This document provides the methodology for accurately calculating the Total capacity of vSAN datastore in an OSA Cluster This is essential for planning a new vSAN Cluster deployment or expansion for an existing vSAN OSA cluster.

Environment

VMware vSAN 7.x - OSA
VMware vSAN 8.x - OSA

Resolution

To determine the effective Total capacity (in TB) of vSAN datastore in a vSAN OSA Cluster:

{Total vSAN datastore Capacity (TB)} = {Number of Hosts in vSAN Cluster} x {Number of Capacity Disks per Host} x {Size of the Capacity Disk(TB)}

Note: This calculation is only applicable if all the vSAN hosts are having identical capacity disk configuration.


Example:
Number of Hosts in vSAN Cluster = 4
Number of Capacity Disks per host = 6
Capacity Disk size = 3.49 TB

Total vSAN datastore Capacity = 4 * 24 * 3.49TB = 83.76 TB