On Wed, Aug 26, 2015 at 11:16 PM, huang jun <hjwsm1989@xxxxxxxxx> wrote: > 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. > I think librbd have two PR related to this. > 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. I guess this(https://github.com/ceph/ceph/pull/4221/files) may help > b) send 4238 messages like this: [set-alloc-hint object_size 4194304 > write_size 4194304,write 0~512] to osds, that spent 227 seconds. I think kernel rbd also need to use https://github.com/ceph/ceph/pull/4983/files > > 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 -- Best Regards, Wheat -- 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
