Hello Hoopdog4242,   If you have all the disk of the array you want to expand replaced with larger drives then you can do an Online Capacity Expansion.   This can be done outside the OS using the F2 system setup: Performing Online Capacity Expansion on PERC controller OCE shown  time mark 1:14 minutes [URL]   Or you can do it from the OS with OpenManage Server Administrator installed in the host OS.   Drill down to the Virtual Disks and select the dropdown next to the VD you want to expand. If the disk group has free space available, you can expand the virtual disk capacity. To expand virtual disk capacity, click Expand Capacity   Dell EMC Server Administrator Storage Management 9.4 User’s Guide [URL]  
I have two RAID sets, one RAID 10 and one RAID 5.  The RAID 5 is has (5) 600GB drives and I would like to swap them all with 1.2TB drives. I've done this before but have always shutdown the server and completed the process via RAID BIOS. This is a Hyper-V server and I need to complete this live, without taking the host offline. I haven't been able to locate step by step instructions for this process. Can someone point me to documentation?  Can I do it all via Server Administrator? 
Replace all drives in RAID 5 set H710 R720