This is a quote from the EC2 book for 70-270:
Also, dynamic disks do not have the same constraints of basic disks. For example, a dynamic disk can be resized on-the-fly without requiring a reboot.
Can someone explain what they mean by resizing on the fly without reboot? I take it to mean choosing Extend the Volume in Disk Mgt which would make it a Spanned volume if it covered 2 physical disks, but I just wanted to make sure there isnt a feature they dont cover in the MSP book.
It's the on-the-fly without reboot that's throwing me off.

Thanks