Re: Ceph networking

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I’ve never done it myself, but the network config options for public/private should take a comma-separated list of CIDR blocks.

The client/public should be fine.

For the backend/private/replication network, that is likely overkill.  Are your OSDs SSDs or HDDs?  If you do go this route, be sure that all OSD nodes can reach each other across both networks.

But really what I suggest is bonding:

* Bond the two 10GE on each node for the public network
* Bond the two 25GE on each node for the private network

Or even the other way around. 

Trying to get traffic balanced with discrete 10 and 25 GE networks could be challenging.

> 
> Hello,
> 
> I have a CEPH cluster with 3 MONs and 6 OSD nodes with 72 OSDs.
> 
> I would like to have multiple client and backed networks. I have
> now 2x 10Gbps and 2x25Gbps NIC in the nodes and my idea is to
> have:
> 
> - 2 client network, for example 192.168.1.0/24 on 10Gbps NICs and
> 192.168.2.0/24 on 25Gbps NICs. One for my clients, one for asynchronous
> syncing to another cluster
> 
> - 2 backend networks, say 10.0.1.0/24 on 10Gbps NICs and
> 10.0.2.0/24 on 25Gbps NICs to have multiple backend paths and/or
> more throughput.
> 
> Is this scenario real? If my clients will be on 192.168.1.0/24
> network, will mon give them a addresses of OSD nodes from
> 192.168.1.0/24 network, or it will give them addresses randomly?
> 
> Please, have someone advice, how to set this networking
> optimally?
> 
> Thanks a lot.
> 
> Sincerely
> Jan Marek
> -- 
> Ing. Jan Marek
> University of South Bohemia
> Academic Computer Centre
> Phone: +420389032080
> http://www.gnu.org/philosophy/no-word-attachments.cs.html
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