The Dell DAS Array will allow for expansion of an existing RAID array if it has space to assign to any existing targets apart of the SAME disk group. As such, assuming you meet these conditions and you have an OS that that supports this mode (i.e. Windows basic and dynamic disks and Linux) then you can perform the steps below to extent an existing virtual disk.

1. Open the Dell Modular Disk Storage Manager utility and choose the Logical tab. Right click the virtual disk you want to extent and choose Increase Capacity. On the informational screen, it will verify what sort of virtual disks are eligible for extents. Assuming you have an OS that supports this activity click on OK to continue.
   
   
   
2. On the Increase Virtual Disk Capacity screen, enter in the size you wish to grow the virtual disk. This adds what you specify ot the current virtual disk. So, if you have a 10 GB virtual disk and add an additional 10 GB's in this window you will have a new virtual disk totaling 20 GB's. Click on OK to continue and to extend the virtual disk.
   
   
   
3. Once the space has been grown you will see a screen similar to the one below. Again, the virtual disk is doing its internal checks and growing the space. So, you should wait for that process to complete before again using the volume. This is depicted below in the screen shot showing the clock on the targeted virtual disk.