Use the VMware vSAN Design and sizing Guide to ensure your cluster is sized properly for your production needs

Products

• VMware vSAN

Issue/Introduction

Before deploying a vSAN cluster please utilize the vSAN design and sizing guide to properly size your environment and workload for your needs. 

As workloads change you may find that your vSAN cluster that was once properly sized for your workload is now under performing as workloads have increased. 

Environment

VMware vSAN

Cause

As workloads change over time on a vSAN cluster you may start to hit limitations of the current deployment leading to potential latency in the environment. Such as Cache devices are now undersized for the current write workload leading to delayed I/O while they offload to capacity tier disks for vSAN OSA clusters, as well as not enough capacity for current production which may result in preventing maintenance tasks such as host reboots or cluster upgrades without impacting running VMs. 

Resolution

Revaluate the vSAN cluster for the current workload by reviewing the VMware vSAN Design Guide in order to accommodate the increased workload for the cluster. The inclusion of additional Hosts / disks may be necessary to handle the increased workload.