[ceph-users] minimum osd size?

Hi all, I have 40 nvme drives with about 20G free space each. Would creating a 10GB partition/lvm on each of the nvmes for an rgw index pool be a bad idea? RGW has about about 5 million objects I don't think space will be an issue but I am worried about the 10G size, is it just too small for a bluestore OSD? thx Frank