Storage space utilization calculation for VM's objects on vSAN Original Storage Architecture (OSA) datastore

Products

• VMware vSAN

Issue/Introduction

This article explains the used space calculation for VM's objects that reside on vSAN Original Storage Architecture (OSA) datastore.

Environment

VMware vSAN 7.x (OSA)

VMware vSAN 8.x (OSA)

Resolution

Refer the following table about RAID configuration set on the VM storage policy, FTT set, Provisioned disk size, Actual data written and Total Object Space utilization on vSAN datastore

RAID Configuration	Failures to Tolerate (FTT)	Provisioned Object Size	Actual Data Written	Total Object Space Utilization
RAID1-Thin	1	100 GB	50 GB	100 GB
RAID5-Thin	1	100 GB	50 GB	66.50 GB
RAID6-Thin	2	100 GB	50 GB	75 GB
RAID1-Thick	1	100 GB	50 GB	200 GB
RAID5-Thick	1	100 GB	50 GB	133 GB
RAID6-Thick	2	100 GB	50 GB	150 GB