Hi Tony,  Host access is controlled at a LUN level, so if you expand the pool and create a new LUN(s) they can then  be added to the appropriate Storage groups to give host(s) discrete access. So yes !  Are the HD's you added the same size and speed as the existing ones in the pool ? Just keep in mind the performance requirements of your apps also.
Hi,  We just add another 5 HD to our CX4-240 SAN.   Currently, there is a Storage Pool with 10 HD and is dedicated to a Windows File Server.  After adding the additional space, we would like to allocate half of newly added space to File Server and the remaining free space for vSphere Cluster.  If I expand the existing Storage Pool, can I create a LUN in it that can be provisioned to vSphere Cluster.  I am new to Storage Pool and the existing one is created by a consultant before.  I have experience with RAID Groups.  Thanking you in anticipation.
Should I expand Storage Pool or create another new one ?