On Mon, Dec 7, 2015 at 9:13 AM, Wuxiangwei <wuxiang...@h3c.com> wrote: > > it looks simple if everything stays as its default value. However, we do want > to change the stripe unit size and stripe count to achieve possible higher > performance. If so, it would be too troublesome to manually do the > calculation every time when we want to locate a given offset(and maybe a > certain interval). The 'cephfs map' and 'cephfs show_location' can provide > good information as we want, but sadly not for ceph-fuse. That's why I ask > for a similar tool.
If you are interested in writing this, you could look at Client::get_file_stripe_address and Striper::file_to_extents. Currently in libcephfs we expose methods for getting the OSDs relevant to a particular file, in case something like hadoop wants to exploit locality, but we don't expose the intermediate knowledge of the object names. I am curious about why you need this? John -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
