When the Dell R420 server is started, press Ctrl+R to enter the array card configuration (the startup shortcut keys are different for different models, you can enter according to the prompts)
1. Press F2 to select "create new VD" to create a new raid
2. After entering, press "Enter" to select raid, here select raid5
3. Check the required hard disk, the cross in the brackets means it has been selected (press Enter to select)
4. You can choose the specific size of the Raid, and you can also configure a name for the Raid
5. Click "OK"
6. Results. When you're done, reboot and you're good to go
7. Press esc to exit and select OK
