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Multiwrite replication works well if all DSAs are connected with high-speed high-bandwidth links.
If some of your DSAs are connected by latent links, updates to the entire directory will be slower. This is because multiwrite replication is synchronous by default. In synchronous replication, an update operation is not confirmed until all the multiwrite peers have applied it, which provides for loadsharing and failover.
If your backbone includes any slow network connections, you should set up multiwrite groups (or regions if you use DXmanager). DSAs connected by slow links should be in different groups.
Within a multiwrite group, replication is synchronous. Between groups, replication is asynchronous.
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