> Also which of the below do you think I should use to get the LBA size on device blockdev --getbsz /dev/nvme0n1 or blockdev --getss /dev/nvme0n1
I believe getbsz will always return the physical block size, while getss will return the logical block size. Most SSDs have a 4096B physical block size, and some support emulating a 512B block size to the host, while still internally maintaining a 4096B physical block size. So if you formatted your namespace 1 for 4096B or 512B, in both cases, getbsz returns 4096B. Only if you formatted your namespace 1 to 512B will getss return 512B. And if you formatted for metadata or protection information, it will be more difficult (you might want to look at a nvme command with nvme-cli instead of using these legacy ioctls).
Regards,
Jeff
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