Edge Security Acceleration:Cache reserve

How it works

After you enable the feature, requests will first go through multiple tiered cache POPs, and if needed, ESA retrieves resources from cache reserve points of presence (POPs). Cache reserve POPs serve as the most upper-tier cache closest to the origin sever. They reserve space for storage, and resources stored on cache reserve POPs are not overwritten by other frequently requested resources. This reduces outbound traffic fees.

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.

Before you begin

• You have purchased a cache reserve instance.

• 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

1. 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.

2. 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.

3. 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.

Enable cache reserve

1. In the ESA console, choose Websites and click the website name you want to manage.

2. In the left-side navigation pane, choose Cache > Cache Reserve.

3. In the Cache Reserve section, click Configure.

4. Turn on the Status switch.

5. 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.

6. Click OK. The feature takes effect in 3 to 5 minutes.

7. 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.

   Note

   Every 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.