How many drives supported on the backplane of R720 you have? Are you having 3TB SAS or SATA drive? If there is no PERC card then you need to connect the backplane to the motherboard so that software raid can detect it. This is supported with 4 X 3.5 backplane R720. You also need to connect the backplane as shown in Figure 3 of below link for software raid to detect the harddrive.
DELL-Shine K
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April 30th, 2021 02:00
How many drives supported on the backplane of R720 you have? Are you having 3TB SAS or SATA drive? If there is no PERC card then you need to connect the backplane to the motherboard so that software raid can detect it. This is supported with 4 X 3.5 backplane R720. You also need to connect the backplane as shown in Figure 3 of below link for software raid to detect the harddrive.
https://www.dell.com/support/manuals/en-us/poweredge-r720/720720xdom/removing-the-hard-drive-backplane?guid=guid-460ea053-a7d7-4d92-aed5-faed86f44d0e&lang=en-us