Virtual disk space reclamation for vSAN

1. New environment vSphere 6.7 U3, VMFS 6 vSAN
2. Old environment vSphere 6, VMFS 5

3. Enable umap
   vsan.unmap_support -e ~CLUSTER_NAME in the vsan cluster

4. Use Veaam to migrate virtual machines from the original vSphere 6 and VMFS 5 to the new environment
5. Upgrade vmtools, virtual hardware upgrade to version 15
6. Start the virtual machine and enter the system
7. View the mount point through df -h
8. fstrim -v mount point name --length nG is used to specify the size of the reclaimed space

The picture below is before recycling

The picture below is after recycling