Hi Oleg, On Fri, 2 Aug 2013, Oleg Krasnianskiy wrote: > Hi > > I have asked this question in ceph-users, but did not get any > response, so I'll test my luck again, but with ceph-devel =) Sorry about that! > Is there any way to copy part of one object into another one if they > reside in different pgs? > There is rados_clone_range, but it requires both objects to be inside one pg. There is no way currently. The clone_range can only (reliably) work on an OSD if it is stored with the same locator key; otherwise you have a ~R/N chance of that happening (where N is the number of OSDs, R is the number of replicas), which isn't worth optimizing for. If the objects aren't stored together, you need to read and then write the data; this avoids adding additional complexity to the OSD for minimal gain. Do you have a use-case in mind where this functionality is important? sage -- 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
