Product : Nutanix, ECP [HCI]/5.11, Ultimate
Feature : Remote Replication Frequency, Disaster Recovery, Data Availability
Content Owner:  Herman Rutten
Summary
Synchronous to remote cluster: continuous
NearSync to remote clusters: 1-15 minutes*
Async to remote clusters: 1 hour
AWS/Azure Cloud: 1 hour
Xi Cloud: 1 hour
Details
AOS 5.5 introduced NearSync replication that leverages light-weight snapshots (LWS). The NearSync feature provides the ability to protect data with up to 1 minute RPO, minimizing data loss in case of a disaster. NearSync allows for a short time to recover, thus providing a low RTO. NearSync places no restrictions on latency or distance and works with all supported hypervisors. NearSync is a best-effort mechanism: whenever for example the network can’t sustain the low RPO, replication will temporarily transition out of near-sync. NearSync requires all changes to be handled in SSD, so a percentage of SSD space is reserved to be used by NearSync when it’s enabled.

NearSync and Continuous (Metro Availability) remote replication are only available in the Ultimate edition.

Acropolis File Services (AFS) officially supports only 1 hour asynchronous replication at this time.

In AOS 5.9+ Asynchronous and NearSync schedules can coexist in a protection domain.