Hi!

i hope someone can help us out here :)

We need to move from 3 datacenters to 2 datacenters (+ 1 small serverroom 
reachable via layer 3 VPN)

NOW we have a ceph-mon in each datacenter, which is fine. But we have to move 
and will only have 2 datacenters in the future (that are connected, so devices 
that are separated geographically can still communicate over their VLANs that 
they are used to have)

in order to still have 3 - to continue being quorate - we have the idea to only 
move 1 ceph-mon into a small separate datacenter. we only are able to connect 
it via VPN though and we'd need a separate IP network and the traffic would be 
over a Firewall and over VPN.

having a separate IP network should work, as mentioned here:

2.1.1.2<https://2.1.1.2/> Monitoring nodes on different subnets

https://documentation.suse.com/ses/7/html/ses-all/storage-bp-hwreq.html

what could possibly go wrong here? can the added latency be a problem? which 
devices would need to be allowed to connect over VPN?

All OSDs < - vpn - > ceph-mon

thank you for any input!


Kind regards

Stefan

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BearingPoint GmbH
Sitz: Wien
Firmenbuchgericht: Handelsgericht Wien
Firmenbuchnummer: FN 175524z

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