Continuous data availability is a key business continuity requirement for storage systems. It ensures protection against downtime in case of serious incidents or disasters and enables recovery to an operational state within a reasonably short period. To ensure continuous availability, storage solutions need to meet resiliency, recovery, and contingency requirements outlined by the organization.
Two key service level agreement (SLA) metrics help measure data availability:
- Recovery point objective (RPO) is the maximum targeted period during which data may be lost due to a major incident.
- Recovery time objective (RTO) is the targeted period of time within which data must be restored after a disaster or disruption in order to avoid unacceptable business impact.