SLD and 3DC PP differences

Synchronous long distance (SLD) and three data center Peer Persistence (3DC PP) both support three data centers. However, the configurations have distinct differences.

Synchronous long distance (SLD)	Three data center Peer Persistence (3DC PP)
Host/server access `System1`, `System2`, and `System3` are connected to different host clusters or servers. `System2` might not have any host cluster connections.	Host/server access `System1` and `System2` are connected to the same host cluster or server. `System3` is connected to a different host cluster or server. Host cluster members connected to `System1` and `System2` must support ALUA multipathing.
Failover Primary failover is typically to the long distance system `System3`. Failover to `System2` is not transparent to host applications.	Failover Transparent failover between synchronous systems (`System1` and `System2`). Automatic failover between synchronous systems (`System1` and `System2`).