hi,all we create a 2TB rbd image, after map it to local, then we format it to xfs with 'mkfs.xfs /dev/rbd0', it spent 318 seconds to finish, but local physical disk with the same size just need 6 seconds. After debug, we found there are two steps in rbd module during formating: a) send 233093 DELETE requests to osds(number_of_requests = 2TB / 4MB), this step spent almost 92 seconds. b) send 4238 messages like this: [set-alloc-hint object_size 4194304 write_size 4194304,write 0~512] to osds, that spent 227 seconds. is there any optimations can we do? -- thanks huangjun -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
