Dell R760: Client didn't provide VROC key - how to setup RAID for NVMe drives? (First server setup)

Hi everyone,

I'm setting up my first server (Dell PowerEdge R760) and I'm stuck on storage configuration. The client who delivered the server didn't include an Intel VROC key for hardware RAID on NVMe drives, and I'm also unsure about the best way to organize the OS and data.

Current setup:

• 4× SAS SSDs (~7TB each) - configured as RAID 10 via PERC H755
• 2× NVMe SSDs (~3.5TB each) - no RAID, currently OS is on one NVMe (not critical, can reinstall)

My questions:

1. NVMe RAID options without VROC key:
   • What are my alternatives? Software RAID (how effective and popular it is)?
   • Should I mirror the two NVMe drives, or use them separately?
2. OS placement - which is better?
   • OS on NVMe or RAID 10 
   • I genuinely don't know which approach is better for a production server
3. What would you do in my situation?
   • I'm leaning toward keeping OS on NVMe for speed, but worried about reliability without RAID

Context:

• Planning to run Active Directory on this server
• Ubuntu Server 24.04 currently installed on one NVMe
• This is my first time setting up enterprise hardware
• Can't buy VROC key right now

Server specs:

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• Dell PowerEdge R760 
• PERC H755 RAID controller
• 4× SAS SSD in RAID 10 (14TB usable, working)
• 2× NVMe SSD (3.5TB each, not configured)

Any advice on best practices would be greatly appreciated!

Thanks in advance!