On Wed, Jun 13, 2018 at 9:35 PM Alessandro De Salvo <Alessandro.DeSalvo@xxxxxxxxxxxxx> wrote: > > Hi, > > > Il 13/06/18 14:40, Yan, Zheng ha scritto: > > On Wed, Jun 13, 2018 at 7:06 PM Alessandro De Salvo > > <Alessandro.DeSalvo@xxxxxxxxxxxxx> wrote: > >> Hi, > >> > >> I'm trying to migrate a cephfs data pool to a different one in order to > >> reconfigure with new pool parameters. I've found some hints but no > >> specific documentation to migrate pools. > >> > >> I'm currently trying with rados export + import, but I get errors like > >> these: > >> > >> Write #-9223372036854775808:00000000:::100001e1007.00000000:head# > >> omap_set_header failed: (95) Operation not supported > >> > >> The command I'm using is the following: > >> > >> rados export -p cephfs_data | rados import -p cephfs_data_new - > >> > >> So, I have a few questions: > >> > >> > >> 1) would it work to swap the cephfs data pools by renaming them while > >> the fs cluster is down? > >> > >> 2) how can I copy the old data pool into a new one without errors like > >> the ones above? > >> > > This won't work as you expected. some cephfs metadata records ID of data pool. > > This is was suspecting too, hence the question, so thanks for confirming it. > Basically, once a cephfs filesystem is created the pool and structure > are immutable. This is not good, though. > > > > >> 3) plain copy from a fs to another one would also work, but I didn't > >> find a way to tell the ceph fuse clients how to mount different > >> filesystems in the same cluster, any documentation on it? > >> > > ceph-fuse /mnt/ceph --client_mds_namespace=cephfs_name > > In the meantime I also found the same option for fuse and tried it. It > works with fuse, but it seems it's not possible to export via > nfs-ganesha multiple filesystems. > put client_mds_namespace option to client section of ceph.conf (the machine the run ganesha) > Anyone tried it? > > > > > >> 4) even if I found a way to mount via fuse different filesystems > >> belonging to the same cluster, is this feature stable enough or is it > >> still super-experimental? > >> > > very stable > > Very good! > > Thanks, > > > Alessandro > > > > >> Thanks, > >> > >> > >> Alessandro > >> > >> > >> _______________________________________________ > >> ceph-users mailing list > >> ceph-users@xxxxxxxxxxxxxx > >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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