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B is correct, Multisite replication mitigates the risks that are identified in two-site replication. In a multisite replication, data from the source site is replicated to two or more remote sites. The illustration provides an example of a three-site remote replication solution. In this approach, data at the source is replicated to two different storage systems at two different sites. The source-to-bunker site (target 1) replication is synchronous with a near-zero RPO. The source-to-remote site (target 2) replication is asynchronous with an RPO in the order of minutes. The key benefit of this replication is the ability to fail over to either of the two remote sites in the case of source-site failure.
Agreeing with JBONINO,
As I understand the question its, multiple sites to replicate to.
A. Talks on a single site failure. (in this case multi-site replication its not relevant cause even if you have a single site replication you are still covered).
B. Talks on 2 sites failure, Prod & remote site. (in that case even if you have 2 sites failures at the same time you still have a site that hold the data in near zero RTO)
A is right.
Remote Replication: Multisite
Data from source site is replicated to multiple remote sites for DR purpose
Disaster recovery protection is always available if any one-site failure occurs
A is right.
In synchronous remote replication, writes must be committed to the source and remote replica (or target), prior to acknowledging “write complete” to the host. Additional writes on the source cannot occur until each preceding write has been completed and acknowledged. This ensures that data is identical on the source and replica at all times. Further, writes are transmitted to the remote site exactly in the order in which they are received at the source. Therefore, write ordering is maintained. If a source-site failure occurs, synchronous remote replication provides zero or near-zero recovery-point objective (RPO).
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