I ran HTTach on one of my VM's and got a graph that looks like this: ___-____----- The low points are all ~35Mbytes/sec and the high points are all ~60Mbytes/sec. This is very reproducible. HDTach does sample reads across the whole disk, so would I be right in thinking that the variation is due to pg's being on different OSD's, and there is a difference in performance because of a difference in my OSD's. Is there a way for me to identify which OSD's are letting me down here? Presently I have 3: #1 - xfs with isize=256 #2 - xfs with isize=2048 #3 - btrfs I have my suspicions about which is dragging the chain, but how could I confirm it? Thanks James _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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