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Tier III (or Level 3, abbreviated as T3 or L3) is the highest level of support in a three-tiered technical support model responsible for handling the most difficult or advanced problems. It is synonymous with level 3 support, 3rd line support, back-end support, support line 3, high-end support, and various other headings denoting expert level ...
Tier III: full N+1 redundancy of all systems, including power supply and cooling distribution paths Tier IV : as Tier III, but with 2N+1 redundancy of all systems A Tier III system is intended to operate at Tier II resiliency even when under maintenance, and a Tier IV system is intended to operate at Tier III resiliency even when under maintenance.
A service desk is a primary IT function within the discipline of IT service management (ITSM) as defined by ITIL. It is intended to provide a Single Point of Contact (SPOC) to meet the communication needs of both users and IT staff, [7] and also to satisfy both Customer and IT Provider objectives.
IT Application Portfolio Management (APM) is a practice that has emerged in mid to large-size information technology (IT) organizations since the mid-1990s. [1] Application Portfolio Management attempts to use the lessons of financial portfolio management to justify and measure the financial benefits of each application in comparison to the costs of the application's maintenance and operations.
A production support analyst or engineer is responsible for monitoring the production environments, servers, scheduled jobs, incident management and receiving incidents and requests from end-users, analyzing these and either responding to the end user with a solution or escalating it to other IT teams.
[citation needed] Operational-level agreements or OLAs, however, may be used by internal groups to support SLAs. If some aspect of service has not been agreed upon with the customer, it is not an "SLA". SLAs commonly include many components, from a definition of services to the termination of agreement. [2]
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DDL—Data Definition Language; DDoS—Distributed Denial of Service; DDR—Double Data Rate; DEC—Digital Equipment Corporation; DES—Data Encryption Standard; dev—development; DFA—Deterministic Finite Automaton; DFD—Data Flow Diagram; DFS—Depth-First Search; DFS—Distributed File System; DGD—Dworkin's Game Driver