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.

>
> 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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-- 
Jason
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