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Module 9: Implementing Caching
Overview
Caching Overview
Configuring General Cache Properties
Configuring Cache Rules
Configuring Content Download Jobs
Lesson: Caching Overview
What Is Caching?
How Caching Works for Requests for New Objects
How Caching Works for Requests for Cached Objects
How Content Download Jobs Work
How Caching Is Implemented in ISA Server 2004
Web Proxy Chaining and Caching
What Is Caching?
ISA Server caching provides:ISA Server caching provides:
Improved performance — information is stored on the computer running ISA Server
Reduced bandwidth usage — no additional Internet network traffic
Improved performance — information is stored on the computer running ISA Server
Reduced bandwidth usage — no additional Internet network traffic
ISA Server caching scenarios include:ISA Server caching scenarios include:
Forward caching — Internet Web servers
Reverse caching — internal Web servers
Forward caching — Internet Web servers
Reverse caching — internal Web servers
ISA Server caching stores a copy of requested Web content in the server memory or on the hard disk
ISA Server caching stores a copy of requested Web content in the server memory or on the hard disk
Server hard disk
Server hard disk
How Caching Works for Requests for New Objects
www.contoso.comwww.contoso.com
http://www.contoso.comhttp://www.contoso.com
Server RAM
Server RAM
66
ISAServer
ISAServer
11 5533
2244
How Caching Works for Requests for Cached Objects
Server hard disk
Server hard disk
www.contoso.comwww.contoso.com
http://www.contoso.comhttp://www.contoso.com
Server RAM
Server RAM
ISAServer
ISAServer
11 33
22
Server hard disk
Server hard disk
How Content Download Jobs Work
www.contoso.comwww.contoso.com
http://www.contoso.comhttp://www.contoso.com
Server RAM
Server RAM
ISAServer
ISAServer
33 55
22
4411
How Caching Is Implemented in ISA Server 2004
ISA Server caching optimizes Web cachingperformance by:ISA Server caching optimizes Web cachingperformance by:
Using RAM and disk caching
Maintaining the RAM cache in physical memory
Maintaining a directory of cached items
Using a single cache file
Providing quick recovery
Using efficient cache updates
Providing automatic cleanup
Using RAM and disk caching
Maintaining the RAM cache in physical memory
Maintaining a directory of cached items
Using a single cache file
Providing quick recovery
Using efficient cache updates
Providing automatic cleanup
Web Proxy Chaining and Caching
InternetInternet
Branch OfficeBranch OfficeHead OfficeHead Office
Branch OfficeBranch Office
11
3355
66
22
44
Lesson: Configuring General Cache Properties
Caching Configuration Components
How to Enable Caching and Configure Cache Drives
How to Configure Cache Settings
Caching Configuration Components
Component Explanation
Define cache drivesEnables caching by configuring a cache drive for storing the cached content
Configure caching settings
Modifies the default TTL and types of cached content
Configure caching rules
Enables unique caching policies for specific Web content
Configure content download jobs
Enables the prefetch of content before clients request the content
How to Enable Caching and Configure Cache Drives
Caching is disabled by default on ISA Server 2004. When you enable caching, ISA Server creates a file with an initial size equal to the size you chose for the maximum cache size on the hard disk
Caching is disabled by default on ISA Server 2004. When you enable caching, ISA Server creates a file with an initial size equal to the size you chose for the maximum cache size on the hard disk
How to Configure Cache Settings
Configurenegative caching
Configurenegative caching
Configurecaching of objects
with undefined TTL
Configurecaching of objects
with undefined TTL
Configure response to request for
unavailable Web site
Configure response to request for
unavailable Web site
Configure memoryused for caching
Configure memoryused for caching
Practice: Configuring General Cache Properties
Enabling Web Caching on ISA Server
Configuring Web caching on ISA Server
Internet
Den-ISA-01
Den-DC-01
Lesson: Configuring Cache Rules
What Are Cache Rules?
How to Create a Cache Rule
Managing Cache Rules
What Are Cache Rules?
Cache rule options Default cache ruleDefine the destination set that the rule applies to Applies to all Web content
Define how content is returned to the user
Returns non-expired content to the user
Define whether content is stored in the cache
Caches the defaultcacheable objects
Define whether to cache HTTP, FTP, or both types of content
Enables caching of both HTTP and FTP content
Define the maximum size for cached objects
Does not apply any size restrictions to cached objects
Define whether to cacheSSL content Caches SSL content
How to Create a Cache Rule
Cache Rule Wizard Page Configuration Options
Cache Rule Destinations
Use destination sets to define the Web content that this rule applies to
Content Retrieval Defines how ISA Server responds to client requests if the content is or is not in cache
Cache Content Defines the types of content ISA Server will cache
Cache Advanced Configuration
Defines maximum size for caching objects and SSL response caching
HTTP Caching Enables and configures TTL settings for HTTP content
FTP Caching Enables and configures TTL settings for FTP content
Managing Cache Rules
Managing cache rules includes:Managing cache rules includes:
Modifying the cache rule configuration after creating the rule
Modifying the cache rule order to evaluate cache rules for specific Web sites before cache rules forall Web sites
Disabling or deleting cache rules that are nolonger required
Exporting the cache rule configuration before modifying the cache rules in case the modification is not successful
Modifying the cache rule configuration after creating the rule
Modifying the cache rule order to evaluate cache rules for specific Web sites before cache rules forall Web sites
Disabling or deleting cache rules that are nolonger required
Exporting the cache rule configuration before modifying the cache rules in case the modification is not successful
Practice: Configuring Cache Rules
Configuring cache rules on ISA Server
Internet
Den-ISA-01
Den-DC-01
Lesson: Configuring Content Download Jobs
What Are Content Download Jobs?
How to Create a Content Download Job
Managing Content Download Jobs
What Are Content Download Jobs?
Content download jobs:Content download jobs:
Allow you to schedule content for download at a specific time even if no user on the network has requested the content
Improve Internet access performance
Can be used to download content to the branch office during nonworking hours
Can be used to ensure access to critical Internet content even when the Internet connection isnot available
Allow you to schedule content for download at a specific time even if no user on the network has requested the content
Improve Internet access performance
Can be used to download content to the branch office during nonworking hours
Can be used to ensure access to critical Internet content even when the Internet connection isnot available
How to Create a Content Download Job
Content Download Job Wizard Page Configuration Options
Download Frequency
Defines a schedule for when the content download will occur
Content Download
Defines the content that willbe downloaded
Includes maximum links, objects,and concurrent connections usedfor downloads
Content CachingDefines what types of content to cache
Defines the TTL for cached content
Managing Content Download Jobs
Managing content download jobs includes:Managing content download jobs includes:
Modifying the content download job configuration after creating the job
Starting content download jobs outside the scheduled time or stopping content download jobs that are running
Disabling or deleting content download jobs that are no longer required
Modifying the content download job configuration after creating the job
Starting content download jobs outside the scheduled time or stopping content download jobs that are running
Disabling or deleting content download jobs that are no longer required
Practice: Configuring Content Download Jobs
Creating a Content Download Job
Internet
Den-ISA-01
Den-DC-01
Gen-Web-01
Lab: Configuring Caching
Exercise 1: Testing and Monitoring ISA Server Caching
Internet
Den-Clt-01
Den-ISA-01
Den-DC-01
Gen-Web-01
