It looks like Ceph (13.2.2) assigns device class "ssd" to our Samsung PM1725a NVMe SSDs instead of "nvme". Is that a bug or is the "nvme" class reserved for a different kind of device?
Nope, this is because (I'n not sure, but I think) is_rotational() function is used to determine from kernel "is hdd or not". So for ssd and nvme behavior the same.
If you prefer (like me) nvme class instead ssd you should create this class by yourself and assign it to your nvme osd's.
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