Not sure why I didn't post this before, but here it is. When installing Nutanix CE on a Dell server (R710 in my case) with a PERC H700 card you can't do a pass-through on the disks. You have to configure them as a single disk RAID0 in the PERC config. Ctrl-R at boot for the H700. That works, but then CE can't detect the type of drive it is. It will fail with a message about missing requirements. You have to tell the install routine which drive is the "rotational" drive.
Exit the install process and login as root:nutanix/4u.
dmesg | grep sda
You might need to do this for sda, sdb, sdc until you find the HDD, not the SSD. The drive sizes should tell you which is the right one.
echo 0 > /sys/block/sd?/queue/rotational
Where sd? is replaced with the correct sd. Logout and log back in as install. Should be fine from there. This is being done with the img install, not the iso. I did get a similar error on the iso but didn't try to work around it. I'll see if it works the same way with that.