High Availability & Disaster Recovery

High Availability

We are all about eliminating single points of failure, increasing redundancy ;

Disaster Recovery

Disaster recovery picks up where high availability fails. Disaster recovery can be as simple as restoring from a backup, but it can also be very complex too depending on two factors: the Recovery Time Objective (RTO) and Recovery Point Objective (RPO).

Recovery Time Objective is the maximum amount of time that a system can be down before it is recovered to an operational state. For some systems, this recovery time objective can be measured in hours or even days, but for more mission-critical systems the recovery time objectives are typically measured in seconds.

Recovery Point Objective is the amount of data loss, measured in time, that is tolerable in a disaster. For some systems, losing a day’s worth of data might be acceptable while for other systems this might be mere minutes or seconds. The length of RTO’s and RPO’s have profound implications on how disaster recovery plans are implemented.