There is an increasing trend towards N+1 UPS architectures – rather than 2N – as IT fault toleran... more There is an increasing trend towards N+1 UPS architectures – rather than 2N – as IT fault tolerance through software continues to improve. There are two common ways N+1 can be achieved: paralleling multiple unitary UPSs together or deploying a single UPS frame with multiple internal modules configured for N+1 redundancy. In this paper, we quantify key tradeoffs between an internal “modular” redundant UPS and parallel redundant UPSs, and show a 27% capital cost savings and a 1-2 week decrease in deployment time when internal redundancy is deployed. We also discuss the importance of fault tolerance within the UPS to ensure availability, reliability, and maintainability needs are met. Revision 2 White Paper 234
Mean Time Between Failure is a reliability term used loosely throughout many industries and has b... more Mean Time Between Failure is a reliability term used loosely throughout many industries and has become widely abused in some. Over the years the original meaning of this term has been altered which has led to confusion and cynicism. MTBF is largely based on assumptions and definition of failure and attention to these details are paramount to proper interpretation. This paper explains the underlying complexities and misconceptions of MTBF and the methods available for estimating it.
INTELEC 05 - Twenty-Seventh International Telecommunications Conference, 2005
To stay competitive in today's rapidly changing business world, companies must update the way... more To stay competitive in today's rapidly changing business world, companies must update the way they view the value of their investment in network-critical physical infrastructure (NCPI). No longer are simply availability and upfront cost sufficient to make adequate business decisions. Agility, or business flexibility, and low total cost of ownership have become equally important to companies that will succeed in a changing global market-place
A floor plan strongly affects the power density capability and electrical efficiency of a data ce... more A floor plan strongly affects the power density capability and electrical efficiency of a data center. Despite this critical role in data center design, many floor plans are established through incremental deployment without a central plan. Once a poor floor plan has been deployed, it is often difficult or impossible to recover the resulting loss of performance. This paper provides structured floor plan guidelines for defining room layouts and for establishing IT equipment layouts within existing rooms.
There is an increasing trend towards N+1 UPS architectures – rather than 2N – as IT fault toleran... more There is an increasing trend towards N+1 UPS architectures – rather than 2N – as IT fault tolerance through software continues to improve. There are two common ways N+1 can be achieved: paralleling multiple unitary UPSs together or deploying a single UPS frame with multiple internal modules configured for N+1 redundancy. In this paper, we quantify key tradeoffs between an internal “modular” redundant UPS and parallel redundant UPSs, and show a 27% capital cost savings and a 1-2 week decrease in deployment time when internal redundancy is deployed. We also discuss the importance of fault tolerance within the UPS to ensure availability, reliability, and maintainability needs are met. Revision 2 White Paper 234
Mean Time Between Failure is a reliability term used loosely throughout many industries and has b... more Mean Time Between Failure is a reliability term used loosely throughout many industries and has become widely abused in some. Over the years the original meaning of this term has been altered which has led to confusion and cynicism. MTBF is largely based on assumptions and definition of failure and attention to these details are paramount to proper interpretation. This paper explains the underlying complexities and misconceptions of MTBF and the methods available for estimating it.
INTELEC 05 - Twenty-Seventh International Telecommunications Conference, 2005
To stay competitive in today's rapidly changing business world, companies must update the way... more To stay competitive in today's rapidly changing business world, companies must update the way they view the value of their investment in network-critical physical infrastructure (NCPI). No longer are simply availability and upfront cost sufficient to make adequate business decisions. Agility, or business flexibility, and low total cost of ownership have become equally important to companies that will succeed in a changing global market-place
A floor plan strongly affects the power density capability and electrical efficiency of a data ce... more A floor plan strongly affects the power density capability and electrical efficiency of a data center. Despite this critical role in data center design, many floor plans are established through incremental deployment without a central plan. Once a poor floor plan has been deployed, it is often difficult or impossible to recover the resulting loss of performance. This paper provides structured floor plan guidelines for defining room layouts and for establishing IT equipment layouts within existing rooms.
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Papers by Wendy Torell