On 2019-07-09T07:27:28, Frank Schilder <frans@xxxxxx> wrote: > Small addition: > > This result holds for rbd bench. It seems to imply good performance for large-file IO on cephfs, since cephfs will split large files into many objects of size object_size. Small-file IO is a different story. > > The formula should be N*alloc_size=object_size/k, where N is some integer. alloc_size should be an integer multiple of object_size/k. If using rbd striping, I'd also assume that making rbd's stripe_unit be equal to, or at least a multiple of, the stripe_width of the EC pool is sensible. (Similar for CephFS's layout.) Does this hold in your environment? -- SUSE Linux GmbH, GF: Felix Imendörffer, Mary Higgins, Sri Rasiah, HRB 21284 (AG Nürnberg) "Architects should open possibilities and not determine everything." (Ueli Zbinden) _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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