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EOR

Posted on May 9, 2024 by
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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.

network architecture

Advantages of EOR

  • 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.

  • 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.

  • 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.

  • 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.

  • 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

Network Architecture
TOR (Top of Rack)
EOR (End of Row)
MOR (Middle of Row)
Location of Switches
Top of individual racks
End of each row
Middle of each row
Server-to-Switch Connectivity
Direct connection between servers and rack-level switches
Servers connect to patch panels, which are connected to row-level switches
Servers connect to patch panels, which are connected to row-level switches
Number of Switches
Each rack has its own dedicated switch
Multiple racks share a single switch at the end of the row
Multiple racks share a single switch in the middle of the row
Cabling Complexity
Simplified cabling within individual racks
Reduced cabling compared to TOR, but longer cable runs within rows
Reduced cabling compared to TOR, shorter cable runs compared to EOR
Scalability
May require more switches as the number of racks increases
Scalable, as additional racks can be connected to the same row-level switch
Scalable, as additional racks can be connected to the same row-level switch
Cable Management
Simplified cable management within individual racks
More complex cable management compared to TOR
Intermediate complexity in cable management
Space Requirement
Requires space at the top of each rack for switches
Requires space at the end of each row for switches
Requires space in the middle of each row for switches
Cost Consideration
Potentially higher cost due to more switches
Potentially lower cost compared to TOR
Moderate cost with a balance between TOR and EOR
 

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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