On Fri, 6 May 2016, Yehuda Sadeh-Weinraub wrote: > On Fri, May 6, 2016 at 12:41 PM, Sage Weil <sweil@xxxxxxxxxx> wrote: > > This PR > > > > https://github.com/ceph/ceph/pull/8975 > > > > removes the 'rados cppool' command. The main problem is that the command > > does not make a faithful copy of all data because it doesn't preserve the > > snapshots (and snapshot related metadata). That means if you copy an RBD > > pool it will render the images somewhat broken (snaps won't be present and > > won't work properly). It also doesn't preserve the user_version field > > that some librados users may rely on. > > > > Since it's obscure and of limited use, this PR just removes it. > > > > Alternatively, we could add safeguards so that it refuses to make a copy > > if there are any selfmanaged_snaps, and/or generate some warnings. > > > > Any objections? > > I prefer the alternative. I found this command pretty useful for > testing config upgrade scenarios with rgw. After generating config > scenarios in older versions, I used this command to store the config > on another pool, and then I could get the different config whenever > needed. Keep in mind that all of these calls in rgw rgw/rgw_rados.cc: epoch = ref.ioctx.get_last_version(); may be subtley broken by cppool because user_version is not preserved... sage _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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