Proper Ceph network configuration

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Hello,

 

We have two separate networks in our Ceph cluster design:

 

10.197.5.0/24 - The "front end" network, "skinny pipe", all 1Gbe, intended to be a management or control plane network

10.174.1.0/24 - The "back end" network, "fat pipe", all OSD nodes use 2x bonded 10Gbe, intended to be the data network

 

So we want all of the OSD traffic to go over the "back end", and the MON traffic to go over the "front end".  We thought the following would do that:

 

public network = 10.197.5.0/24   # skinny pipe, mgmt & MON traffic

cluster network = 10.174.1.0/24  # fat pipe, OSD traffic

 

But that doesn't seem to be the case -- iftop and netstat show that little/no OSD communication is happening over the 10.174.1 network and it's all happening over the 10.197.5 network.

 

What configuration should we be running to enforce the networks per our design?  Thanks!

 

Jon Heese
Systems Engineer
INetU Managed Hosting
P: 610.266.7441 x 261
F: 610.266.7434
www.inetu.net

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