NVMe and RAID both assume you have certain capabilities in your system.
If you have 2 year old blades, that your company determined would have a 5 year lifecycle at purchase, you have 3 years to live with them. You have one free mezz slot and 2x2.5" drive bays, possibly filled with your boot disks if not booting from SAN. NVMe isn't an option. And the RAID will be all of two drives. Or you add a FusionIO card, in your manufacturers mezzanine slot configuration and add 100,000 IOPS to your application.
It's an odd ball example. But there's still plenty of valid use cases.
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