> On May 27, 2025, at 6:05 PM, Ryan Rempel <rgrem...@cmu.ca> wrote:
> 
> Where ceph-hvcore1 is my host, /dev/sdb is the spinning disk, and 
> /dev/mapper/nvmepool-dbwal.26 is the path to the LVM logical volume I had 
> created on the SSDs (well, actually, NVMe,

Remember that NVMe devices *are* SSDs ;)

> but I'm passing it through to a ceph VM, so ceph doesn't see its full 
> character).

That layer does impact performance, but you can use a udev rule to override the 
kernel’s rotational attribute on the device if you feel it’s faster than an 
HDD, which will influence certain Ceph option settings.
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