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  2. Data centre tiers - Wikipedia

    en.wikipedia.org/wiki/Data_centre_tiers

    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.

  3. Technical support - Wikipedia

    en.wikipedia.org/wiki/Technical_support

    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 ...

  4. ISO/IEC 19770 - Wikipedia

    en.wikipedia.org/wiki/ISO/IEC_19770

    The second generation was published in 2012. It retained the original content (with only minor changes) but splits the standard up into four tiers which can be attained sequentially. These tiers are: Tier 1: Trustworthy Data; Tier 2: Practical Management; Tier 3: Operational Integration; Tier 4: Full ISO/IEC ITAM Conformance

  5. IT service management - Wikipedia

    en.wikipedia.org/wiki/IT_service_management

    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.

  6. Data center network architectures - Wikipedia

    en.wikipedia.org/wiki/Data_center_network...

    The three-tier is the common network architecture used in data centers. [10] However, three-tier architecture is unable to handle the growing demand of cloud computing. [11] The higher layers of the three-tier DCN are highly oversubscribed. [3] Moreover, scalability is another major issue in three-tier DCN.

  7. Information technology management - Wikipedia

    en.wikipedia.org/wiki/Information_technology...

    The latter refers to management methods tied to the automation or support of human decision making. [2] IT Management refers to IT related management activities in organizations. MIS is focused mainly on the business aspect, with a strong input into the technology phase of the business/organization.

  8. ITIL - Wikipedia

    en.wikipedia.org/wiki/ITIL

    ITIL (previously and also known as Information Technology Infrastructure Library) is framework with set of practices (previously processes) for IT activities such as IT service management (ITSM) and IT asset management (ITAM) that focus on aligning IT services with the needs of the business.

  9. For Dummies - Wikipedia

    en.wikipedia.org/wiki/For_Dummies

    DOS For Dummies became popular due to the rarity of beginner-friendly materials for using DOS. The Windows title written by Andy Rathbone was soon released. While initially the series focused solely on software and technology topics, it later branched out to more general-interest titles, with topics as diverse as Acne For Dummies , Chess For ...