On Tue, Jun 4, 2019 at 8:07 AM Jason Dillaman <jdill...@redhat.com> wrote:
>
> On Tue, Jun 4, 2019 at 4:45 AM Burkhard Linke
> <burkhard.li...@computational.bio.uni-giessen.de> wrote:
> >
> > Hi,
> >
> > On 6/4/19 10:12 AM, CUZA Frédéric wrote:
> >
> > Hi everyone,
> >
> >
> >
> > We want to migrate datas from one cluster (Hammer) to a new one (Mimic). We 
> > do not wish to upgrade the actual cluster as all the hardware is EOS and we 
> > upgrade the configuration of the servers.
> >
> > We can’t find a “proper” way to mount two rbd images from two different 
> > cluster on the same host.
> >
> > Does anyone know what is the “good” procedure to achieve this ?
>
> Copy your "/etc/ceph/ceph.conf" and associated keyrings for both
> clusters to a single machine (preferably running a Mimic "rbd" client)
> under "/etc/ceph/<cluster-name>.conf" and
> "/etc/ceph/<cluster-name>.client.<id>.keyring".
>
> You can then use "rbd -c <old cluster name> export --export-format 2
> <image-spec> - | rbd -c <new cluster name> import --export-format=2 -
> <image-spec>". The "--export-format=2" option will also copy all
> associated snapshots with the images. If you don't want/need the
> snapshots, just drop that optional.

That "-c" should be "--cluster" if specifying by name, otherwise with
"-c" it's the full path to the two different conf files.

> >
> > Just my 2 ct:
> >
> > the 'rbd' commands allows specifying a configuration file (-c). You need to 
> > setup two configuration files, one for each cluster. You can also use two 
> > different cluster names (--cluster option). AFAIK the name is only used to 
> > locate the configuration file. I'm not sure how well the kernel works with 
> > mapping RBDs from two different cluster.....
> >
> >
> > If you only want to transfer RBDs from one cluster to another, you do not 
> > need to map and mount them; the 'rbd' command has the sub commands 'export' 
> > and 'import'. You can pipe them to avoid writing data to a local disk. This 
> > should be the fastest way to transfer the RBDs.
> >
> >
> > Regards,
> >
> > Burkhard
> >
> > --
> > Dr. rer. nat. Burkhard Linke
> > Bioinformatics and Systems Biology
> > Justus-Liebig-University Giessen
> > 35392 Giessen, Germany
> > Phone: (+49) (0)641 9935810
> >
> > _______________________________________________
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> > ceph-users@lists.ceph.com
> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
>
>
> --
> Jason



-- 
Jason
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