Yes, this should work fine.
You'll have a master US-Database in the US, and a master UK-Database in
the UK, with each replicating to the site. Local-disk failover works
fine at both ends for both master and replica databases.
Extending to a third site should also be fine, just keep in mind that a
network brown out to either of the replica sites will degrade your
foreground performance in order to enforce the lag limit.
Wayne.
On 07/18/2012 12:40 PM, Danny Sinang wrote:
Hi,
We currently have a 3-node ML cluster here in the US (let's call them
US1, US2, US3), with forest replication and failover enabled.
Should we need to expand to Europe, would the setup below achieve :
1. Traffic Localization (during normal operations)
2. Continued ML availability (in the event we ever need to bring
one cluster down for hardware or software upgrades / fixes)
?
*Draft EU Expansion Plan*
1. Set up another 3-node ML cluster in Europe (EU1, EU2, EU3),
with forest replication and failover enabled.
2. Also replicate the forests of the US cluster to the EU clusters
and vice versa
3. Direct US customers (via some geo DNS) to US webservers which
use US1, US2, and US3
- This would save US customer data to the forests on US1,
US2, and US3
4. Direct EU customers to EU webservers which use EU1, EU2, and EU3
- This would save EU customer data to the forests on EU1,
EU2, and EU3
5. Should the US ML Cluster ever go down, point the US websevers
to the EU ML Cluster
- I'm hoping this would activate and make available the
data from US1, US2, and US3 on EU1, EU2, and EU3. Am I correct ?
- Same thing should happen the other way around (i.e. if
EU ML cluster goes down, point EU webservers to US ML cluster)
Do you think this would work ?
Is there a better way to achieve our goals ?
How do we extend this model should the time come for us to expand to
Asia ?
Regards,
Danny
--
Wayne Feick
Principal Engineer
MarkLogic Corporation
[email protected]
Phone: +1 650 655 2378
www.marklogic.com
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