Home > Storage > PowerStore > Virtualization and Cloud > Dell PowerStore: VMware vSphere Best Practices > Mapping or unmapping practices
After a volume is created, mapping specifies the hosts that the PowerStore array presents storage to.
For ESXi hosts in a cluster, we recommend using host groups to uniformly present storage to all initiators for reduced management complexity (see the following two figures). This practice allows a volume or set of volumes to be mapped to multiple hosts simultaneously and maintain the same logical unit number (LUN) across all hosts.
If a VMFS datastore is no longer required, the best practice is to unmount the datastore from the vCenter (see the following figure). Then, detach the disk devices from each host in the cluster (see Figure 21) before unmapping and deleting the volume from the PowerStore Manager. This gracefully removes a datastore and can prevent an all paths down (APD) state from occurring.