Hi,
I'm looking to build a ceph cluster in a multi datacenter architecture.
Datas will be stored on DC1 and DC2 (mon + osds), and we'll have a third datacenter DC3, with a monitor only for quorum
2x dark fiber
DC1<--------------------->DC2
|<--------------------> |
| |
| |
|--------->DC3<-----------
Latency is very short, so no problem.
Main usage of the cluster is rbd, and we'll have qemu-kvm virtual machines running on each side.
We are planning to have around 5-6 nodes for the cluster at the beginning.
I would like to known what could be the best number of ceph node on each side. (like 3nodes on DC1 and 2 nodes on DC2 ?).
What could be the best replication ?
How to tune the crushmap of this kind of setup ?
and last question : It's possible to have the reads from vms on DC1 to always read datas on DC1 ?
I would like to minimize the bandwith of the fibers to write only.
Regards,
Alexandre
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