Hi, You are going to want to configure the iDRAC through ctrl+E during post to give it an IP address. A static address is recommended so that it doesn’t change. Once this is done you can use a web browser on your Windows 10 machine to access that IP address and you can access a web gui that allows you to monitor and do remote access through the browser. This will work outside the OS or with no OS installed, you just need a monitor for the initial configuration of the IP address.   There is not an OMSA version for FreeBSD/FreeNAS.     There is not any need to export the configuration prior to replacing the drives since you will creating a new configuration.   FreeNAS may not work properly with an H700. 
Hello all, Thanks in advance for helping out a complete newbie to server architecture. I'm an experienced custom desktop PC builder for almost two decades, but I recently purchased a used R510 and have realized I have much to learn! This server is being used in my home, not a business setting. Objectives:  Background: Here's an ongoing thread I have over at the FreeNAS forums, in case it is useful for reference, or anyone is trying to emulate what I'm attempting and find it useful reading. Here's a link to my Dell Service Tag so you can see how the server was configured from Dell.  The server currently is setup in a RAID configuration using the H700 with 10 drives combined into a single virtual drive. That drive has Windows Server 2016 Standard installed and activated on it. There's also an iDrac Enterprise card installed.  Questions: How do I setup the iDrac management to use OMSA? Once FreeNAS (based upon FreeBSD) is installed, I won't have any Windows environment to install Windows-based utilities. Based on my reading (someone correct me if I'm wrong!) OMSA needs to be installed on both the management station (my primary Windows 10 desktop) and on the R510 too, inside of Windows. Can one take full advantage of the remote management features without having an operating system installed? If so, how does one start to configure this? I've read that iDrac Enterprise works in a pre-OS environment, which is exactly how I'd want to access it once FreeNAS is installed. What needs to be installed/configured on the R510 to make this happen? What needs to be installed/configured on my Windows 10 desktop to access it once configured, or can everything on the management desktop be done over a web-browser?  Those are my main concerns right now, and if anyone can point a complete server beginner in the right direction, I'd really appreciate it. I realize I have much to learn. Thank you for your assistance!
R510 Questions: iDrac Setup, OSMA, vFlash, FreeNAS