I am following the steps here: http://docs.ceph.com/docs/mimic/rados/operations/bluestore-migration/
The final step is: ceph-volume lvm create --bluestore --data $DEVICE --osd-id $ID I notice this command doesn't specify a device to use as the journal. Is it implied that BlueStore will use the same (OSD) device for the function? I don't think that's what I want (I have spinning disks for data, and SSDs for journals). Is there any reason *not* to specify which device to use for a journal, when creating an OSD with BlueStore capability?
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