[Openstack-operators] Shared storage for live-migration with NFS, Ceph and Lustre

Miguel A Diaz Corchero miguelangel.diaz at externos.ciemat.es
Wed Jun 17 09:06:47 UTC 2015

Hi friends.

I'm evaluating different DFS to increase our infrastructure from 10 
nodes to 40 nodes approximately. One of the bottleneck is the shared 
storage installed to enable the live-migration.
Well, the selected candidate are NFS, Ceph or Lustre (which is already 
installed for HPC purpose).

Creating a brief planning and avoiding network connectivities:

*a)* with NFS and Ceph, I think it is possible but dividing the whole 
infrastructure (40 nodes) in smaller clusters, for instance; 10 nodes 
with 1 storage each one. Obviously, the live-migration is only possible 
between nodes on the same cluster (or zone)

*b) *with Lustre, my idea is to connect all the nodes (40 nodes) to the 
same lustre (MDS) and use all the concurrency advantages of the 
storage.  In this case, the live migration could be possible among all 
the nodes.

I would like to ask you for any idea, comment or experience. I think the 
most untested case is b), but has anyone tried to use Lustre in a 
similar scenario? Any comment in any case a) o b) are appreciated.


/Miguel Angel Díaz Corchero/
/*System Administrator / Researcher*/
/c/ Sola nº 1; 10200 TRUJILLO, SPAIN/
/Tel: +34 927 65 93 17 Fax: +34 927 32 32 37/

CETA-Ciemat logo <http://www.ceta-ciemat.es/>

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