I *think* the rotational flag isn't used at OSD creation time, but rather each time the OSD starts to select between options that have _hdd and _ssd values. If I'm mistaken, please do englighten me. One can use a udev rule to override the kernel's deduced rotational value > On Sep 12, 2024, at 10:08 AM, Frank Schilder <frans@xxxxxx> wrote: > > > - How deployed (lvm+dm-cache first, then OSD or other way around): This is related to the previous question. The order might be important. My guess is that after attaching the cache the rotational flag from the cache device is inherited. If this happens before OSD creation, the OSD will be created with SSD tunings and with HDD tunings otherwise. How did you do it? _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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