Auto Scaling vs Manual Scaling: Who Adjusts Capacity?

Mon, 03 Aug 2026 06:33:25 +0900

Overview

Auto scaling and manual scaling both change how much compute capacity an application has, but they differ in who — or what — decides when that change happens. Auto scaling relies on an automated feedback loop that watches metrics and reacts on its own, while manual scaling depends on human intervention to notice load and issue the change. That difference in decision-maker drives everything else: reaction speed, cost efficiency, and how much ongoing attention the system needs.

Spot Instances vs On-Demand Instances: When Cheap Compute Comes With Strings Attached

Mon, 03 Aug 2026 06:25:19 +0900

Overview

Both are ways to rent compute capacity from a cloud provider, but they trade cost against reliability in opposite directions. Spot Instances tap into unused capacity at steep discounts but can be reclaimed with almost no notice, while On-Demand Instances cost more per hour in exchange for a guaranteed, uninterrupted slot.

Comparison Diagram

Comparison Table

Aspect	Spot Instances	On-Demand Instances
Request & provisioning	Fulfilled only if provider has spare capacity at your bid price	Fulfilled immediately from reserved capacity pools
Capacity guarantee	None — provider can reclaim the instance at any time	Guaranteed for as long as you keep paying
Pricing model	Variable, set by real-time supply and demand for spare capacity	Fixed hourly rate published by the provider
Interruption behavior	Reclaimed with a short warning (e.g. ~2 minutes on AWS)	Never interrupted by the provider; you control shutdown
Cost predictability	Fluctuates; can spike or be revoked when demand rises	Stable and predictable, easy to forecast in a budget
Ideal workloads	Fault-tolerant, stateless, or checkpointable batch jobs	Stateful, latency-sensitive, or continuously running services
Termination control	Provider-initiated; your app must handle abrupt shutdown	User-initiated; you decide exactly when it stops

Key Differences

Spot pricing floats with market demand and can be up to 90% cheaper than On-Demand rates
Spot capacity is reclaimable at any time, typically with only a short warning window
On-Demand gives a firm capacity guarantee that Spot never promises
Workloads on Spot need to tolerate sudden termination or design for checkpointing
On-Demand cost is fixed and predictable, while Spot cost is variable and market-driven

When to Use Each

Spot Instances

Cost-Optimization on IT Comparison

Auto Scaling vs Manual Scaling: Who Adjusts Capacity?

Overview

Spot Instances vs On-Demand Instances: When Cheap Compute Comes With Strings Attached

Overview

Comparison Diagram

Comparison Table

Key Differences

When to Use Each