It should work with production servers, but it would be best to schedule it for the lightest part of the day as it will impact performance. When doing it on a production machine do a backup first in case there is any unexpected power failure or other event that would interrupt it and possibly cause array corruption. 
Hello.  I have a PowerEdge R720XD with 4 disks in a hardware RAID 5 Array (#4 is a hot spare, so it is not included in the array itself).  I want to add another disk to the array to increase the useable size, while keeping one hot spare and RAID 5.  OS is Server 2012 Standard (which probably doesn't matter for this conversation) I installed a new disk (same as the others) into the server.  When I access the Lifecycle Controller, I don't see any option to add a disk to the RAID array.  When I go through the RAID configuration, it looks like reconfiguring the array would destroy the existing array and create a new one, which I would think would destroy my data.  Would reconfiguring the array this way delete all of my data on the existing array? Does anyone know if I can add a disk to the array without losing my existing data?  And if so, how do I accomplish this? 
Adding a Disk to a RAID 5 Array