Regarding VPLEX data mobility

Hi,

I have 4 questions regarding VPLEX data mobility, can somebody help ? Thank you in advance.

1. Can i replace a low-level device(the leg device of a RAID-1 device).with a new device? I can only select the top-level device in the VPLEX Navisphere GUI.

2. Can i replace the extents of a RAID-1 device ? The RAID-1 device consists of two low-level devices(legs),

3. Can i replace the extents of a RAID-1 device ? The RAID-1 device consists of a low-level device and a extent.

4. The extent mobility button is not available in my VPLEX Navisphere GUI, why?