Cisco Cisco Content Acquirer Application Release Notes

Assigning a cache storage priority to a delivery service enables the CDN operator with multiple tenants 
to provide preference settings for keeping cached content for a delivery service. By default, the Content 
Manager deletes cached content based on popularity (an algorithm involving the number of cache hits, 
the size of the content object, and the decay of the content object). The cache storage priority setting 
assigned to a delivery service influences the content popularity and thereby the content that is evicted.

Each cache storage priority class is identified with a name and has a popularity multiplication factor. The 
popularity multiplication factor ranges from 0 to 100, where 0 is the lowest priority and 100 is the highest 
priority. If no cache storage priority classes are defined or assigned to a delivery service, the default 
multiplication factor of 50 is used. 

Following are two examples of how the storage priority class is applied:

Content with a storage priority class of 100 that is accessed once has the same priority as content 
with a storage priority class of 50 that is accessed twice. 

Content with a storage priority class of 0 is always the first to be evicted regardless of how many 
times the content is accessed.

The storage priority class must first be defined before it can be assigned to a delivery service. To define 
a storage priority class and assign it to a delivery service, do the following:

In the CDSM GUI, choose Services > Service Definition > Storage Priority Classes. The Storage 
Priority Classes table is displayed.

In the task bar, click the Create New icon. The Storage Priority Class Definition page is displayed.

To edit a storage priority class, click the Edit icon next to the storage priority class name.

Enter the settings as appropriate. See 

 for descriptions of the fields.

Click Submit to save the settings.

Choose Services > Service Definition > Delivery Services > Definition. The Delivery Services 
Definition page is displayed.

From the Storage Priority Class drop-down list, select the storage priority class to assign to the delivery 
service. The default option sets the Storage Priority Class to 50.

Click Submit to save the settings.

Class Name

Unique name for the storage priority class.

Storage Popularity 
Multiplication Factor

Factor used to multiply the popularity of the content by. The range is from 0 
to 100, where 0 is the lowest priority and 100 is the highest priority. Content 
with a Storage Popularity Multiplication Factor of 0 is always evicted first, 
regardless of popularity calculated. The default is 50.

Comments

Information about the storage priority class.