Thank you for the info. I did use the Automatic option, which did add 15 disks to the “Performance” pool and added 2 disks to “Hot Spares”. As you said, there was no noticeable performance hit & I didn’t hear any complaints from our connected users. It took about 40 minutes to configure the drives.  I did create a new datastore under “VMWare” successfully.
I have added 7 additional disks to an existing DAE plus 1 additional DAE with 12 drives in a VNXe3150 dual SP configuration. It is my understanding that I need to go into Unisphere under VNXe, System, Storage Pools in order to add these unconfigured drives to the pool I want and to be sure to add them as RAID 5 (4+1), which is the way these pools are currently configured.   I see there are two ways of doing it: Automatic (let Unisphere decide how to add the 15 disks and 2 spares we'll need and then Manual (I choose how to allocate the drives).  Question #1 Is there a reason to do automatic over manual configuration other than Unisphere decides which drives to use as Hot Spares and which drives to use in your Performance pool? Question #2 When I add these drives, is there any reason not to do it while they are in production (will it have any adverse affect on my users during the workday when I add the drives to the pool? Question #3  After I add them to the approrpriate pool, where is it that you configure the LUNS?  I am using these in a vmware esxi environment.  Will it be apparent to me once I add them to the pool?  Thanks in advance for any good tips, as I am new to this task.
Adding unconfigured disks to an existing pool currently in production