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Chapter 11 Scalability and Availability Overview
If you plan to use a parallel model, Allaire recommends that you use many middle
range servers rather than fewer high-end ones or lots of inexpensive ones. Servers
that provide adequate capacity and are moderately priced can generally
accommodate all your needs just as well as expensive ones at a fraction of the
cost.
Systems monitoring
In addition to redundant hardware, you should ensure that your network and the
mission-critical sites that reside on its servers are supported by systems monitoring
software. This type of software actively and continuously monitors an application’s
availability and its service levels. These monitoring programs must not only be able
to detect problems, but they must also be able to route alerts to the correct
administrators for immediate notification of problems.
Corrective actions
The third major failover consideration is the corrective actions that need to occur if a
failure causes a server to become unavailable. Generally speaking, if a server goes
down and causes your site to become unavailable, some level of human interaction is
usually required to effectively diagnose and correct the problem.
However, before the analysis and repair can happen, the administrator needs to be
notified. Whatever failover system you put in place, it should include an automated
notification system that can route alerts via your telecommunications infrastructure
(e-mail, pagers, real time web-based alerts, etc.) to the appropriate administrator for
prompt attention.
Besides notifying the administrator that a problem has occurred, you also want your
failover solution to automatically redirect traffic intended for the unavailable server
to other available servers until the unavailable server is fixed. This crucial corrective
action is what keeps your Web site up and available to your users even if one of the
servers supporting it is experiencing problems.
Summary of Contents for COLDFUSION 5-ADVANCED ADMINISTRATION
Page 1: ...Macromedia Incorporated Advanced ColdFusion Administration ColdFusion 5...
Page 20: ......
Page 56: ...38 Chapter 1 Advanced Data Source Management...
Page 74: ...56 Chapter 2 Administrator Tools...
Page 76: ......
Page 86: ...68 Chapter 3 ColdFusion Security...
Page 87: ...To Learn More About Security 69...
Page 88: ...70 Chapter 3 ColdFusion Security...
Page 130: ...112 Chapter 5 Configuring Advanced Security...
Page 132: ......
Page 154: ...136 Chapter 6 Configuring Verity K2 Server...
Page 162: ...144 Chapter 7 Indexing XML Documents...
Page 202: ...184 Chapter 8 Verity Spider...
Page 236: ...218 Chapter 10 Verity Troubleshooting Utilities...
Page 238: ......
Page 348: ...330 Chapter 14 ClusterCATS Utilities...
Page 349: ...Using sniff 331...
Page 350: ...332 Chapter 14 ClusterCATS Utilities...
Page 362: ...344 Chapter 15 Optimizing ClusterCATS...
Page 372: ...354 Index...