SCNET · Enterprise IT · Ankara, Türkiye
High availability is a design decision rather than a product: which component can fail without stopping the service. Every additional nine raises cost and complexity together.
'No outages ever' is neither measurable nor achievable. The measurable target is this: in which failure scenario does the service recover, and how quickly.
The availability target sits where business need meets budget. As the target tightens, cost rises exponentially rather than linearly, and that curve belongs on the table during the decision.
Redundancy is bounded by the weakest link. Servers may be paired while a single switch, circuit or power feed breaks the chain. The map is drawn and each single point is either closed or consciously accepted.
Redundancy is only known to work by deliberately failing a component. Planned failure tests run in stages: first a redundant component, then a whole node, then a link.
A large share of outages comes from change rather than failure. High availability includes performing planned maintenance without interruption; otherwise redundancy exists only on paper.
No. Redundancy absorbs a component failure in the same place; disaster recovery absorbs the loss of an entire facility. They answer different scenarios and do not substitute for each other.
That is answered per service. Within one organization a few hours of downtime may be acceptable for one service while another is limited to minutes; a single target is never applied to everything.
No. Cloud offers the means for redundancy but the design remains your decision; an application built in one region depends on one region in cloud too.
Let's discuss how much downtime each service can accept and look at the cost curve together.
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