On Tue, Jun 4, 2019 at 4:45 AM Burkhard Linke <Burkhard.Linke@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> 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. > > 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 > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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