EOR
What is EOR (End of Row)?
EOR (End of Row) represents a network architecture where networking equipment, such as switches, is located at the end of each row of server racks within a data center or server room. Servers within each rack connect to a patch panel, and the patch panel is then connected to the switch at the end of the row. EOR is based on each row of cabinets and refers to the provision of a unified network access point at the end of each row of cabinets. EOR architecture reduces the number of switches compared to TOR, as multiple racks share a single switch at the end of the row.
Advantages of EOR
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1. Simplified Cable Management: With EOR, the network switches are located at the end of each row of server racks. This arrangement reduces the cable lengths required to connect the servers to the switches, simplifying cable management and reducing cable clutter.
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2. Centralized Management: By placing the switches at the end of each row, EOR architecture centralizes the network management. It provides a single point of control and easier access to the switches for configuration, monitoring, and maintenance purposes.
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3. Scalability: EOR architecture allows for easy scalability as additional server racks can be added to the row, and they can be connected to the existing switch at the end of the row. This simplifies the expansion and growth of the network infrastructure.
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4. Improved Airflow and Cooling: Placing the switches at the end of the row helps in optimizing airflow within the server racks. It promotes better cooling efficiency by ensuring that the hot air generated by the servers is directed towards the end of the row, reducing the risk of hotspots.
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5. Cost Efficiency: EOR architecture typically requires fewer switches compared to TOR (Top of Rack) architecture. This can result in cost savings in terms of equipment procurement, power consumption, and maintenance.
TOR vs EOR vs MOR
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Network Architecture
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TOR (Top of Rack)
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EOR (End of Row)
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MOR (Middle of Row)
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|---|---|---|---|
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Location of Switches
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Top of individual racks
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End of each row
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Middle of each row
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Server-to-Switch Connectivity
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Direct connection between servers and rack-level switches
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Servers connect to patch panels, which are connected to row-level switches
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Servers connect to patch panels, which are connected to row-level switches
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Number of Switches
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Each rack has its own dedicated switch
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Multiple racks share a single switch at the end of the row
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Multiple racks share a single switch in the middle of the row
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Cabling Complexity
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Simplified cabling within individual racks
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Reduced cabling compared to TOR, but longer cable runs within rows
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Reduced cabling compared to TOR, shorter cable runs compared to EOR
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Scalability
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May require more switches as the number of racks increases
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Scalable, as additional racks can be connected to the same row-level switch
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Scalable, as additional racks can be connected to the same row-level switch
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Cable Management
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Simplified cable management within individual racks
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More complex cable management compared to TOR
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Intermediate complexity in cable management
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Space Requirement
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Requires space at the top of each rack for switches
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Requires space at the end of each row for switches
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Requires space in the middle of each row for switches
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Cost Consideration
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Potentially higher cost due to more switches
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Potentially lower cost compared to TOR
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Moderate cost with a balance between TOR and EOR
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It's important to note that the suitability of each architecture depends on the specific requirements, scale, and constraints of the network infrastructure. The table provides a general comparison, but the final decision should be based on factors such as the size of the data center, number of servers, scalability needs, cabling complexity, available space, and budget considerations.
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