Dell PowerFlex 4.5.x Technical Overview

Recovery point objective

The recovery point objective (RPO) is the maximum data loss, which is measured in units of time, that would be lost in a disaster or outage.

PowerFlex uses journal-based replication to achieve very low RPO and ensure minimal data loss. To ensure RPO compliance, PowerFlex replicates at least twice for every RPO period. For example, setting RPO to one minute means that PowerFlex can immediately return to operation at the target system with loss of only one minute of data. In order to achieve an RPO of one minute, replication takes place at least every 30 seconds. RPO compliance is calculated according to when the application data arrives at the target journal. Achieving RPO is the most important consideration in replication management. The user-defined RPO is the goal of replication. Even so, RPO compliance is not guaranteed. The system reports RPO compliance for each RCG.

Data protection enables replication to multiple systems from one source system to up to four target systems.