For approach 1: The cluster needs a quorum:
https://help.marklogic.com/knowledgebase/article/View/119/0/start-up-quorum-and-forest-level-failover Approach 2: This looks more like DR. Failover will not be automatic. However, if the replica cluster is running before the master goes down, then it should continue to run. The documentation for these is good. For failover (keep the main cluster highly available), see http://docs.marklogic.com/guide/cluster For DR (keep another cluster ready), see http://docs.marklogic.com/guide/database-replication On Tue, Jul 26, 2016 at 6:28 PM, Vinayagamoorthy, Kalidoss < [email protected]> wrote: > > Hi, > > Good Evening!!! > > Looking for some help to setup forest replica in a best way to setup > Disaster Recovery environment. Two approaches have been tried out. Please > find below the scenarios I have tried and the issues are found against my > expectations. > > > *Approach #1 - Same Cluster* > > Currently, the cluster has 3 hosts in testing environment. The DB is > split into 3 forests as follows. > > - DB-F1 (host1) > - DB-F2 (host2) > - DB-F3 (host3) > > *DB-F1's* replica setup in host 2&3 > > > - DB-F4-F1(host2) > - DB-F5-F1(host3) > > > > *DB-F2's* replica setup in host 1&3 > > - DB-F6-F2(host1) > - DB-F7-F2(host3) > > > *DB-F3's* replica setup in host 1&2 > > > - DB-F8-F3(host1) > - DB-F9-F3(host2) > > > > Later we introduced one more host "4" for Disaster Recovery . All split > forests from host 1,2 & 3 are replicated in host-4 as follows. > > DB-F10-F1 - Replica for *DB-F1* > DB-F11-F2 - Replica for *DB-F2* > DB-F12-F3 - Replica for *DB-F3* > > > *Test scenario:* > > Hosts - 1,2 & 3 are down. Only Host-4 is up. And App service(HTTP) > should work. > > > *Expectation:* > > Host-4 alone is able to handle the data. > > *Issues:* > > - The fail over his not happened to host-4. > - Admin page in Host-4 couldn't be loaded. > - HTTP-API in Host-4 doesn't seem working. > > > > *Approach #2 - Two Clusters* > > In this way, I have created 2 clusters. > > - Cluster #1 has Host 1,2 &3. > - Cluster #2 has Host 4 > > > *Test scenario:* > > In cluster #1 all hosts are down > > *Expectation:* > > Host-4 in cluster #2 alone is able to handle the data. And App > service(HTTP) should work. > > *Issue:* > > > - The fail over is not happened to cluster #2. > - HTTP-API in Host-4 doesn't seem working. > > > > Based on my testing both approaches were failed. Looking for the > suggestion to setup the fail over model in correct way. > > > Thanks > Kalidoss.V > > > > > _______________________________________________ > General mailing list > [email protected] > Manage your subscription at: > http://developer.marklogic.com/mailman/listinfo/general > >
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