I run a vdi check. I got no 'fix' messages but, looking at sheep.log I see something like Aug 10 20:11:11 [io 9616] get_object_sha1(490) fail to get sha1, /mnt/sheep/dsk03/000e4aa500000293 Aug 10 20:11:11 [io 9582] get_object_sha1(490) fail to get sha1, /mnt/sheep/dsk03/000e4aa500000294 What does that mean?