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SYSTEM MANAGEMENT ENVIRONMENT FOR APPLICATION DELIVERY INFRASTRUCTURE
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In an Application Delivery Infrastructure environment, where information resources are centralized, the need for tools and procedures that serve to decrease the frequency of unscheduled downtime is more important than ever The organizational mandate for an application delivery platform and full, secure control of the environment dictates that the operations necessary to support the environment have more in common with the Network Operation Center (NOC) of an Internet service provider (ISP) or commercial hosting service than with a traditional, distributed corporate network It is no longer acceptable for IT staff to discover problems after they occur, as an audit function They must have tools and procedures in place to perform predictive analysis on potential problems and to isolate and contain problems during the troubleshooting process An effective systems management environment will address these needs through measurement of the various systems and through the enforcement of service-level agreements The data collected during measurement can be used in troubleshooting and making corrections For example, if a XenApp Server crashes due to an application fault, the EdgeSight package will have recorded which applications were running at the time of the crash Without this information, it would be challenging to find the crash s exact cause An effective SME has the following objectives: Improving the availability and performance of the server and network resources Lowering the cost of IT maintenance and support services Providing a service-level view of server and network resources The people part of the three Ps is made up not only of users and IT staff, but also any group affected by the services being delivered For many organizations, this means external customers, business partners, and even competitors The SLAs associated with the services being delivered, and the associated reports, are the process part of the three Ps and are, collectively, the tool that shows whether the preceding objectives are being met The product consists of all the hardware and software necessary to deliver the information needed to measure the SLAs Any technology utilized in the SME should meet the following basic requirements: Provide a central point of control for managing heterogeneous systems A central point refers to one tool or collection mechanism used to gather information from all sources The actual data repository could be distributed to multiple locations where administrative activity takes place Allow event management across heterogeneous systems and network devices The toolset should support all the common operating system and network hardware platforms and provide enough extensibility for custom interfaces to be configured, if necessary Provide service-level views of any portion of the infrastructure A service-level view is an aggregation of lower-level events that correlate to show the impact of various failures in terms of an established SLA A message stating Server 110 has crashed
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with an unknown error has far less meaning than Application service capacity has decreased by 10 percent or Application services for users in the San Antonio region have been interrupted To further refine these requirements, more detail on the exact duties to be incorporated in the SME is needed Defining in specific terms what will be measured and how it will be measured will greatly aid in the selection of the proper technology We will discuss SME tools later in the chapter
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Arguably, the most common problem in managing distributed computer systems is configuration management Even companies with very organized IT staffs can have complete chaos on the desktop with regard to which application or application versions are installed and which changes to the operating system are allowed In an application infrastructure environment, the chaos, so to speak, is limited to the data centers, but the need for configuration management is even greater If a user changes a setting on their PC that causes it to crash, that user experiences unscheduled downtime If an administrator makes a change to a Presentation Server that causes it to crash, every user currently logged onto that server experiences unscheduled downtime An effective SME must have in place controls to restrict and audit changes within the data center A configuration management system should have the following characteristics: A clearly defined operational baseline The baseline defines the starting point for the management process A change tracking system A process for requesting, submitting, prioritizing, approving, and testing changes to the operational baseline Once a change has completed the process, it becomes part of the baseline Defined categories and priorities for changes For example, some changes need to be tracked, such as changes to group membership and administrative rights, but can be safely implemented as an extension of the current baseline Others must be implemented very quickly and may disrupt user activity, such as critical security patches From a software management perspective, most organization configuration management systems differentiate between patches, enhancements, and major revisions, and often employ a release process where any or all of these must be tested and certified in a development/test environment before implementation in production systems Implementation procedures Necessary steps that must be taken before implementation, such as how to save the current state before a change, how to decide if a change is not working, how to back out of a change, and how to use collected information to modify the original change request and resubmit it Modern computing environments are far too complex for an automated tool to check and restrict any change A combination of an effective automated tool and best practice procedures for change management is the key to a successful configuration management function
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