M.2 drives not showing in C220 M5 UEFI BIOS

[3dmark]

I have a C220 M5 which was installed with a UCS-MSTOR-M2 storage carrier and 2 2540GB SATA M.2s (UCS-M2-240GB). When booting with UEFI, I do not see the drives listed anywhere when entering the BIOS via F2. This includes when I check for available boot devices where I only see UEFI Shell and PXE Boot, etc. I checked the BIOS and verified all controllers were in AHCI mode but no luck. I have no need for software raid as this is for an ESXi install.

If I boot into legacy BIOS, I do see the 2 micron drives as boot options however, my Mellanox cards no longer show up.

Documentation states I shouldn't expect to see this in the CIMC but, I should at least see these as boot options. UEFI Shell does list two pci devices as BLK0 and BLK1. I don't have the RAID carrier so I'm not concerned about having redundancy in this case.

[3dmark]

I should also add that the system us running firmware 4.1(3c).

[3dmark · Accepted solution]

I may have answered this myself. I thought I would see the local drives as boot options in the BIOS if everything was working as expected. I slapped an ESXi install disk in to test and I do see the Micron drives as install options. After a test install I can see the drive as a boot option in the BIOS and CIMC. I figure because of the boot record.

[Steven Tardy]

As you figured out in UEFI BIOS mode it is the OS responsibility to add a boot option to BIOS.

(Which sometimes get cleared and needs to be manually reconfigured after CMOS clear or motherboard replacement.)

[3dmark]

Thank you for the reply and confirmation Steven!