Solid state disks
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| In today's economy,
delivering high-density, scalable and
reliable storage
solutions to market quickly is a necessary for storage solution designer,
OEMs, system
integrators so they can keep the competitive edge they need for continued
success.
Serial Attached SCSI
has defined a device called an expander, allowing thousand combinations of
storage expansion to achieve the needs for IT professional on storage
availability, flexibility, scalability, and performance. However, with the
conventional method, this requires IT engineers to create many more complex
storage backplanes that may be dedicated to only one single solution. The limitation on conventional method backplane board The predominant high availability physical interconnect technology between the hot swap hard disk drives and storage host bus adapters reply on transmission of data streams through a piece of physical PCB board (Backplane Board). In Serial Attached SCSI systems the SAS expander is located on the backplane as shown in fig 1 below. | |||||
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| With the conventional method,
all expanders are embedded on the backplane board. But because of the size of
the expander foorprint and/or other
IC components this can
increase the form factor IT engineers have to carefully balance the trade-offs
between reliability, scalability, performance and availability of the
application requirements. This flexibility limitation on the conventional
backplane design has forced designers to implement separate systems for each
type of solution and bear the costs of additional backplane design, addition
layers, prototypes, troubleshoot, manufacture and support. Failure of individual
components in a backplane means a complete replacement of a new backplane
causing single points of failure that can block access to the system, This
results in high support cost and increased total cost of ownership. The conventional method of backplane design (shown in fig 2 below) forces designers to use more than 20 PCB layers, generates unnecessary signal skew, crosstalk and DC interference, blocks airflow, restricts failed over and device addressability as well as configuration flexibility and stands as a barrier to throughput performance, storage scalability and system flexibility and availability. |
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| The new backplane and
daughter board
As the conventional backplane design method shown above has many shortcomings for implementing SAS systems IT engineers require new solutions that bring new levels of ease and simplicity. The most important characteristic of the new method developed by TST (shown in fig 3 below) is its flexibility to support every storage solution available in the storage world. This includes two physical parts: the Drive Backplane Board and Expander Daughter Board. These two boards are connected with easy-swap high-speed connectors and enables highly flexible storage topologies. The backplane boards can support swappable daughter boards which are interchangeable within the same enclosure and can be used to build high-availability systems with no single points of failure. This method use the same backplane board for multiple solutions, just by changing the Daughter board with the expansion capability you require, will provide for a pay-as-you-grow platform so customers can migrate to their unique solutions as needed. Because every solution uses the same backplane, cost reduction then can achieved, In addition, it offers competitive advantage in the marketplace by meeting compliance deadlines, lowering the cost of building (as opposed conventional backplanes) and offering reliable, user-friendly products to their end-customers ahead of any other competitor in the marketplace. | |||||
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The new connection scheme
provides many benefits:-
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