Improve cache hit ratio with multi-level cache-Edge Security Acceleration(ESA)-阿里云帮助中心

Edge Security Accelerator (ESA) caches origin server resources on globally distributed nodes at different tiers, delivering content from the nearest location to reduce latency and origin load.

Overview

ESA operates 3,200+ edge nodes with intelligent routing and a hierarchical cache mechanism. Cache nodes are organized into tiers — some closer to users, others closer to your origin. Requests hit the nearest tier first and escalate only on a cache miss. An origin fetch occurs only as a last resort, so most content is served from ESA's global network — reducing origin load, lowering bandwidth costs, and accelerating delivery.

Multi-level cache types

Note

The Cache Warm-up feature is unavailable when multi-level cache is set to Edge Tiered Cache.

Configuration	Description
Edge Tiered Cache	Single-tier architecture using edge cache nodes to improve hit ratio and access performance. Edge nodes are the most widely distributed tier, ensuring a nearby cache for each user.
Edge Tiered Cache + Regional Tiered Cache	Two-tier architecture that improves origin fetch performance. Regional nodes consolidate traffic from edge nodes within the same region, reducing direct origin fetches.
Edge Tiered Cache + Smart Tiered Cache	Two-tier architecture with a higher hit ratio and lower origin load. Best for consolidating origin fetch traffic. Intelligent cache nodes sit near the origin. Fewer nodes consolidate fetch traffic and increase the hit ratio.
All Cache Tiers	Three-tier architecture that consolidates origin fetch requests in high-traffic scenarios. Available only with the Enterprise plan. Contact Us to request access.

Configure multi-level cache

In the ESA console, select Websites, and in the Website column, click the target site.
In the left-side navigation pane, choose Caching > Tiered Cache.
In the Tiered Cache section, click Configure.
Select a cache method, check "I confirm that no ESA address book is referenced", and click OK. The settings take effect in 3 to 5 minutes.
Note
With the Enterprise plan, select All Cache Tiers to further improve your cache hit ratio.

Plan availability

Cache tier	Free	Basic	Standard	Advanced	Enterprise
Edge Cache Tier	Supported	Supported	Supported	Supported	Supported
Edge Cache Tier + Regional Cache Tier	Not supported	Supported	Supported	Supported	Supported
Edge Cache Tier + Intelligent Cache Tier	Not supported	Supported	Supported	Supported	Supported
All Cache Tiers	Not supported	Not supported	Not supported	Not supported	Contact sales for customization