re-Assign hot spare HDD to Raid

Hi,

Actually yes you can do it. After remove hot spare drive, you can use online capacity expansion. I believe below article useful for you, please take a look at it:

Steps:

1. Access the BIOS by F2 > Device Settings
   
   Figure 1: Expand Virtual Disk 

2. Select RAID Controller
   
   Figure 2: Expand Virtual Disk 

3. In the Dashboard view, select Main Menu
   
   Figure 3: Expand Virtual Disk 

4. Select Virtual Disk Management
   
   Figure 4: Virtual Disk Management

5. Select the Virtual Disk to be changed
   
   Figure 5: Select the Virtual Disk 

6. In the drop-down, select Reconfigure Virtual Disks and press the GO button
   
   Figure 6: Expand Virtual Disk 

7. Select the RAID Level and press Choose the Operation button
   
   Figure 7: Select RAID Level for Virtual Disk 

8. Select the disks to be added to Virtual Disk and press Apply Changes button
   
   Figure 8: Apply Changes to Virtual Disk 

9. Confirm the operation and click YES.
   
   Figure 9: Confirm the Virtual Disk changes 

10. Press the Start Operation button
    
    Figure 10: Start the Virtual Disk Expansion

11. Press the OK button to complete the operation.
    
    Figure 11: Ok to complete Virtual Disk expansion

12. To view the status of the Virtual Disk 
    
    Figure 12: View Status of Virtual Disk expansion

After the reconstruction starts, the system can be left in the RAID BIOS until complete, or the system can be rebooted into the operating system.
 

it is possible to do it from iDRAC  console  , minimizing the downtime ?  

( performance impact is accepted ) 

thank's

You can use OMSA and iDRAC please take a look below videos

https://dell.to/40K0q3i

How to change RAID Level or Size of a configured Virtual Disk in iDRAC9 and PERC BIOS

I'll try , 

many thank's