Your data centers seem to be pretty close, some 13-14km? If it is a more
or less straight fiber run then latency should be 0.1-0.2ms or
something, clearly not a problem for synchronous replication. It should
work rather well.
With "only" 2 data centers however, you need to manually decide if there
is an outage how to proceed unless you have a third mediator node.
Writing on both sides if the network is down will lead to inconsistent
data so it is unsafe to automatically restart services and a stonith
approach may just kill the working node instead of the faulty one. With
that in mind a separate data center as a disaster recovery plan is a
good idea (we have 3 data centers for ceph with similar distances,
redundant network in between and really quite good write performance).
Just plan for the most common failure scenarios and good luck, you seem
to be doing well :)
/Peter
Den 2018-01-29 kl. 19:26, skrev Nico Schottelius:
Hey Wido,
[...]
Like I said, latency, latency, latency. That's what matters. Bandwidth
usually isn't a real problem.
I imagined that.
What latency do you have with a 8k ping between hosts?
As the link will be setup this week, I cannot tell yet.
However, currently we have on a 65km link with ~2ms latency.
In our data center, we currently have ~0.4 ms latency.
(both 8k pings).
Do you see similar latencies in your setup?
Best,
Nico
--
Modern, affordable, Swiss Virtual Machines. Visit www.datacenterlight.ch
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