Sebna,  Yes, that is the correct, and also the supported procedure for increasing the array size. The only issue I see that you could run into is if you were to do something like a system state backup, which can cause issues due to the differences in disks and size. Plus as you had said, the resizing of the VHD. Let us know how it goes, and if you need any other assistance. 
Hi, I need to expand the size of my VHD for file server but only way to do it is by transferring it to bigger storage space as my current RAID1 setup is out of space. Could you let me know if the below steps look correct? Quick background: I have Power Edge 2950 with PERC 5/i and  6x 3.5 inch slots. Two are occupied by RAID 1 with MS Hyper-v, another two by File server again in RAID 1 and final two by email server in RAID 1. My plan of action was: 1. Shutdown the physical server. 2. Remove two HDDs making RAID 1 with Email Server 3. Insert in their place two new HDDs and configure them in PERC 5/i as RAID 1 4. Boot to Hyper-v 5. In hyper-v management console Export and import File Server to newly created volume out of new RAID 1 config.  6. Shutdown physical host. 7. Remove two HDDs creating RAID 1 which are hosting original File Server 8. Put in back RAID 1 hdds with Exchange server in place of RAID 1 with old File Server 9. During POST Import foreign config (with Exchange server) when prompt  Done? Unless there is a simpler way? Or am I a missing something (other then of course resizing of VHD once on new RAID 1 config?  Thanks guys  
PERC 5/i question