Edge Security Acceleration (ESA) provides the cache reserve feature to converge origin requests. After you enable the feature, cache reserve points of presence (POPs) serve as top-tier cache for your resources. This allows ESA to retrieve resources from cache reserve POPs, which reduces outbound traffic fees. Cache reserve POPs reserve space for storage. Resources stored on cache reserve POPs are not overwritten by other frequently requested resources.
Introduction
The cache reserve feature is suitable when the cache hit ratio is low. When the cache hit ratio is high, you can configure a cache rule to bypass cache reserve for specific requests. This helps reduce storage costs. For information about cache rules, see Configure cache reserve eligibility.
Prerequisites
A cache reserve instance is purchased. Before you enable cache reserve, contact your account manager or submit a ticket to apply for a cache reserve instance that has a specific storage capacity in the region that is closest to the origin server.
Manage the lifecycle of cache reserve instances
Purchase an instance
You are charged for cache reserve instances on a subscription basis. To purchase an instance, contact your account manager or submit a ticket. ESA automatically creates the instance upon purchase.
Change the storage capacity of an instance
If you want to increase or decrease the capacity of a cache reserve instance, contact your account manager or submit a ticket.
Release an instance
If you do not renew a subscription, the instance is automatically released after it expires. Cached resources on the cache reserve POPs become invalid.
Procedure
Log on to the ESA console.
In the left-side navigation pane, click Websites.
On the Websites page, find the website that you want to manage, and click the website name or View Details in the Actions column.
In the left-side navigation pane, choose .
In the Cache Reserve section, click Configure.
Turn on the Status switch.
Select a cache reserve instance from the instance list.
You must select an instance in the region closest to the origin server. For example, if the origin server resides in the China (Hong Kong) region, select an instance in the region. If no instance is available, you can make a request to your account manager or submit a ticket.
Click OK. The feature takes effect in 3 to 5 minutes.
Optional. Disable cache reserve when you no longer need it. It takes 3 to 5 minutes to actually disable the feature after you switch off the status toggle. Then, requests to the origin do not pass through cache reserve POPs.
NoteEvery cache reserve instance can be associated with up to 20 websites. The association is removed when the cache reserve feature is disabled for a website.
Availability
The cache reserve feature is available only in Enterprise plans. You are charged for the cache reserve feature on a subscription basis.