Good afternoon mates,
To remove a datastore in vmware, I must follow the following step:
1-Unmount all my Host Esxi from the datastore that I will remove. Since the datastore can see all my Esxi.
2- Remove the datastore to be deleted.
These three steps that I am indicating are the correct ones to execute?
Waiting for your comments.
Assuming you're using vSphere 5.x/6.x, check the following VMware KB article: How to unmount a LUN or detach a datastore device from ESXi hosts (2004605) | VMware KB
About your steps, the number #1 is OK, but number #2 and #3 seems confusing.
You will need to perform two steps:
Deleting the VMFS file system from the LUN is not required, unless you want to recreate it for some reason, such as replacing VMFS5 with VMFS6.