Using active/passive one-to-many replication topology to upgrade HCP systems from RAIN to SAIN
An active/passive one-to-many replication topology lets you replicate different tenants and default-namespace directories from a single primary system to multiple different replicas. You might do this, for example, if the replicas are at sites where users need read access to only a limited number of namespaces. Those sites can then have HCP systems that use smaller amounts of storage.
You can also use an active/passive one-to-many replication topology to upgrade your HCP systems from RAIN to SAIN. This scenario assumes you currently have a RAIN primary system replicating to a RAIN replica on an active/passive link. A SAIN primary system must replicate to a SAIN replica. To make this happen:
Procedure
Create a second active/passive link from the RAIN primary system to the SAIN system that will be the primary system after the upgrade.
Use this link to replicate all the HCP tenants, HCP namespaces, and default-namespace directories in the RAIN system.Create a replication link from the new SAIN primary system to the second SAIN system.
Include the link created in Step 1 above in this link to create a replication chain.When replication is completely up to date, fail over the link from the RAIN system to the SAIN system.
To enable replication to become completely up to date, you may need to stop clients from writing to the RAIN system before you fail over the link.Delete the link from the RAIN system to the SAIN system.
Decommission the two RAIN systems.