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When the LFSCK engine scans the system, it locate the object via the found FID against the low layer device that sometimes is bottom device (OSD/OSP) and sometimes is LOD. So the object handled by LFSCK sometimes is OSD-object/OSP-objecgt and sometimes is LOD-object. Such non-unity may bring trouble to some LFSCK functions. The desirable case is that all the LFSCK functions only handle bottom objects (OSD-object for local, OSP-object for remote).
Please refer to http://review.whamcloud.com/#/c/11845/6/lustre/osd-ldiskfs/osd_handler.c,cm for more discussion.
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