1 / 12

Lecture no 16: Sentralization and desentralization

Lecture no 16: Sentralization and desentralization. TDT4285 Planlegging og drift av IT-systemer Spring 2008 Anders Christensen. Server or peer-to-peer. Peer-to-peer: The machines are autonomous units, sharing eachothers resources. Examples: Win for workgroups, Mac

irene-horton
Download Presentation

Lecture no 16: Sentralization and desentralization

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lecture no 16: Sentralization and desentralization TDT4285 Planlegging og drift av IT-systemer Spring 2008 Anders Christensen TDT4285 Planl&drift IT-syst

  2. Server or peer-to-peer • Peer-to-peer: The machines are autonomous units, sharing eachothers resources. Examples: Win for workgroups, Mac • Server: Sentral parts of the system is located at special purpose machines. Examples: NT and Novell. TDT4285 Planl&drift IT-syst

  3. Advantages of peer-to-peer • Easy to get started • Scales well initially, with low overhead • Autonomous, does not need any formal organization • Based on natural power users • Focuses on local customs rather than formal, top-down organization. • Administrative overhead is hidden and incorporated in other costs TDT4285 Planl&drift IT-syst

  4. Advantages of sentral servers • Manageable – through strategies and policies • Well-defined responsibilities • Makes administrative overhead visible • Reuse and sharing of resources • Limits the number of variants • Allows division of work and expertise • Commercially exploitable TDT4285 Planl&drift IT-syst

  5. Trends IT becomes a critical activity for the organization Central scientific computers Central ~1985 PCs and Micro computers Lokal mini computers Cost efficiency Quality and control De-central Personal, pervasive computing ~1975 ~1995 TDT4285 Planl&drift IT-syst

  6. Candidates for centralization • The sysadmin of distributed systems that are sufficient similar to allow a central staff of specialized employees • Server consolidation to reduce the number of computers by running several services at the same server computer • Infrastructure – services that are used as standard services, and which are transparent to other services. • Know-how, centralization allows the employees to specialize TDT4285 Planl&drift IT-syst

  7. Candidates for de-centralization • Special systems, for which you need special know-how that is not reusable • Fault tolerance: de-centralization is duplication, which is reduncancy • Close support of and adaptation to the users • Strategically important systems over which control must be maintained TDT4285 Planl&drift IT-syst

  8. The ”IDI-model” ”New” tasks Strategically Important tasks Buying services Local and peculiar Support for R&D Standardized tasks Tasks being phased out TDT4285 Planl&drift IT-syst

  9. The ”IVT-model” for (de-)centralization Tasks common to Several suborgs are sentralized Group Printes Department Mail User support Backup Faculty Special software Tasks which are specific to one single department, are de-centralized NTNU TDT4285 Planl&drift IT-syst

  10. Traditional model Complete solution Sysadmin Internal services Local User support Tailored solutions Negotiated agreement Users Solutions for administration External provider TDT4285 Planl&drift IT-syst

  11. A challenge of communication Division of responsibility Local user support Central organization Close Communication Uses User Computer system TDT4285 Planl&drift IT-syst

  12. Outsourcing You need to: • Know what you already have, and what you need • Be able to express what you want • Use sufficient time Remember: your out-sourcing partner often has more expertise on out-sourcing, and is at an advantage. TDT4285 Planl&drift IT-syst

More Related