You can use space efficiency techniques to reduce the amount of space for storing data. These techniques reduce the total storage capacity required to meet your needs.
vSAN 6.7 Update 1 and later supports SCSI unmap commands that enable you to reclaim storage space that is mapped to a deleted vSAN object.
You can use deduplication and compression on a vSAN cluster to eliminate duplicate data and reduce the amount of space required to store data. Or you can use compression-only vSAN to reduce storage requirements without compromising server performance.
You can set the Failure tolerance method policy attribute on VMs to use RAID 5 or RAID 6 erasure coding. Erasure coding can protect your data while using less storage space than the default RAID 1 mirroring.
You can use deduplication and compression, and RAID 5 or RAID 6 erasure coding to increase storage space savings. RAID 5 or RAID 6 each provide clearly defined space savings over RAID 1. Deduplication and compression can provide additional savings.