on 04-19-2016 5:01 AM
Dear Floks,
In a landscape with 3 HANA appliances where 2 for HA (production site) and 1 for DR (remote site), system replication is take place.
Both HA and DR will apply system replication (we don't use storage replication and backups method).
Between HA nodes: synchronous mode
Betwwen HA and DR nodes: asynchronous mode
And per my understanding, there are primary (A) and secondary (B) system role in the production. Log are syncrhonize from A to B.
So, how about the system (C) in DR ? Is the replication from A to C or B to C here ?
What's/Any dependence of the replication between A and B vs A/B and C?
Many thanks.
Regards
Gary
Hi Gary,
I never came across this scenario however as per below link, lets assume site A, site B and site C. Site A is primary for site B and site B is primary for site C. please check the link here
Using command line:
SAP HANA Administration Guide - SAP Library
Using studio :
SAP HANA Administration Guide - SAP Library
Hope this helps,
Regards,
Pradeep
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Hi Gary,
Yes, you're correct. I hope in that case, we need to manually take care of the replication setup configuration. for example; let's assume site B is crashed, we need to manually re-setup the configuration of replication. A site is primary and C site is secondary until the B site comes back online.
(A-->B-->C) is normal replication scenario
(A-->C) is replication scenario when site B is unavailable or crashed (Need manual system replication setup)
Since downtime is not required in the primary server for re-setup of replication with site C, system will be available to the users.
Thanks,
Pradeep
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By the way, according to this setup, remote DR replication will be impacted if HA synchronization in PRD site fail or Node 2 have problem.
The advantage I can think of is to offload the Primary system resouce utilization (3rd node depends on 2nd node only and have no direct contact to 1st node).
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