{"id":227128,"date":"2024-11-07T08:11:13","date_gmt":"2024-11-07T16:11:13","guid":{"rendered":"https:\/\/zpesystems.com\/?p=227128"},"modified":"2024-11-07T08:11:20","modified_gmt":"2024-11-07T16:11:20","slug":"end-of-row-vs-top-of-rack-zs","status":"publish","type":"post","link":"https:\/\/zpesystems.com\/end-of-row-vs-top-of-rack-zs\/","title":{"rendered":"End of Row vs Top of Rack Deployments"},"content":{"rendered":"

[et_pb_section fb_built=”1″ admin_label=”section” _builder_version=”4.16″ custom_margin=”0px||||false|false” custom_padding=”0px||||false|false” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row admin_label=”row” _builder_version=”4.27.2″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” width=”100%” custom_margin=”||0px||false|false” custom_padding=”0px||0px||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_post_title meta=”off” _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_post_title][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”]The terms end-of-row and top-of-rack refer to two different approaches to data center architecture design. Both approaches have advantages and disadvantages that make them suited to different use cases or teams, with neither being the clear \u201cwinner\u201d overall. This blog compares end-of-row vs. top-of-rack deployments based on crucial factors like cost, management complexity, scalability, and resilience<\/a> to help organizations choose the right approach for their environment.<\/p>\n

 <\/p>\n

What is an end-of-row (EoR) deployment?<\/h2>\n

[\/et_pb_text][et_pb_image src=”https:\/\/zpesystems.com\/wp-content\/uploads\/2024\/11\/ZPE-Graphic-Request-IR-Nov-4.jpg” alt=”ZPE Graphic Request IR Nov 4″ title_text=”ZPE Graphic Request IR Nov 4″ _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”]In data center deployments consisting of multiple rows of racks or cabinets, it\u2019s common for teams to consolidate all the networking for each row in one physical location, rather than deploying switches in every single rack. All patch cables for the devices in a particular row are run to the dedicated networking cabinet, which is typically (but not always) at the end of the row. An end-of-row (or EoR) architecture requires fewer switches than a ToR deployment, which helps reduce costs and management complexity while enabling easier scaling.<\/p>\n

One of the main drawbacks of this architecture is that the EoR switch is a single point of failure for the entire row. If that switch fails due to a botched update, ransomware attack<\/a>, or other adverse event, the whole row loses network access. Running cables from each cabinet to the EoR can also get messy very quickly, especially at scale. In the long run, it\u2019s also a less flexible architecture that forces teams to consider an entire row of infrastructure every time they want to change or upgrade networking components.<\/p>\n

 <\/p>\n

What is a top-of-rack (ToR) deployment?<\/h2>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.2″ _module_preset=”default” width=”auto” custom_padding=”1px||||false|false” border_color_top=”#78828A” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/zpesystems.com\/wp-content\/uploads\/2024\/11\/ZPE-Graphic-Request-IR-Nov-4-1.jpg” alt=”ZPE Graphic Request IR Nov 4 (1)” title_text=”ZPE Graphic Request IR Nov 4 (1)” _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” custom_padding=”30px||||false|false” border_width_top=”1px” border_color_top=”#D6D6D6″ global_colors_info=”{}”]In a top-of-rack data center architecture, DC teams install one or more switches in every rack of their deployment; despite the name, the switch doesn\u2019t need to actually be at the very top of the rack. A ToR deployment keeps copper\/Ethernet patch cables inside the rack, which helps with cable management. It also eliminates the single-point-of-failure that an EoR switch represents \u2013 if one ToR switch goes down for some reason, only the devices within that rack are affected, vs. the entire row. Another major benefit of EoR deployments is that each rack becomes a modular unit that DC teams can modify, upgrade, or scale without necessarily affecting other racks in the row.<\/p>\n

On the other hand, a ToR deployment requires more switches than an EoR deployment, which can increase costs and complexity. More switches equate to more power draw, and they add an extra network hop to local traffic that could possibly affect throughput. Each switch must also be monitored, secured, and regularly patched, potentially creating more work for infrastructure teams. As a result, ToR deployments are also more challenging to scale, as each new rack added to the data center requires an additional ToR switch.<\/p>\n

Comparing end-of-row vs top-of-rack deployments: Which should you choose?<\/h2>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n
<\/th>\nEnd-of-Row<\/th>\nTop-of-Rack<\/th>\n<\/tr>\n<\/thead>\n
Number of switches<\/th>\nOne or more per row<\/td>\nOne or more per rack<\/td>\n<\/tr>\n
Cable management<\/th>\nRequires patch cables running along the entire row<\/td>\nKeeps patch cables within the rack or cabinet<\/td>\n<\/tr>\n
Cost<\/th>\nFewer switches and lower power draw keeps costs down<\/td>\nMore switches and higher power draw gets more expensive<\/td>\n<\/tr>\n
Complexity<\/th>\nFewer switches to secure, manage, and troubleshoot<\/td>\nMore devices to manage<\/td>\n<\/tr>\n
Ease of scaling<\/th>\nCan deploy an entire new row with only one networking cabinet<\/td>\nEach new rack requires one or more switches<\/td>\n<\/tr>\n
Flexibility<\/th>\nInflexible; networking changes affect entire row<\/td>\nEach rack is a modular unit that can be changed without affecting others<\/td>\n<\/tr>\n
Resilience<\/th>\nEoR switch is a single point of failure for the entire row<\/td>\nOne rack\u2019s switch can go down without affecting any other racks<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Both EoR and ToR architectures have advantages and disadvantages, with neither being the clear-cut winner for every possible use case.<\/p>\n

End-of-row deployments are more cost-effective and easier to manage and scale, so they\u2019re often favored by smaller, leaner IT teams or, on the opposite end of the spectrum, very large (or hyperscale<\/a>) data centers. For example, a large cloud provider might prefer EoR to cut down on the number of switches to purchase, deploy, and manage at their hubs.<\/p>\n

Top-of-rack deployments are modular, flexible, and resilient, which makes them a great choice for DevOps teams that need the ability to add or change components at any time without affecting the entire architecture. For example, managed service providers<\/a> might prefer ToR so they can easily customize or update one customer\u2019s rack without worrying about how the changes will impact others.<\/p>\n

How Nodegrid improves resilience for EoR and ToR deployments<\/h2>\n

Nodegrid serial console switches<\/a> can be deployed top-of-rack or end-of-row to improve the resilience of either architecture. Nodegrid switches connect to the serial port on data center devices to provide out-of-band (OOB) management<\/a>, allowing teams to remotely manage and troubleshoot DC equipment even when the primary network is down. They isolate the management interfaces<\/a> for data center infrastructure, making them inaccessible to malware or malicious actors on the production network. Plus, Nodegrid also provides network failover to keep business-critical services running during adverse events.<\/p>\n

Nodegrid serial consoles have an open architecture that can integrate and host other vendors\u2019 software and virtualized network functions. That means a single Nodegrid box could theoretically replace an entire rack of networking hardware, streamlining EoR deployments and making ToR architectures more feasible for lean, budget-strapped IT teams. Plus, Nodegrid switches and all connected devices can be remotely managed from a single, on-premises<\/a> or cloud-based<\/a> software platform, significantly reducing management complexity for either deployment.
\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row use_custom_gutter=”on” _builder_version=”4.27.2″ _module_preset=”default” background_color=”#214C64″ width=”auto” custom_padding=”15px|15px|15px|15px|false|false” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” text_font=”||||||||” text_text_color=”#FFFFFF” header_3_text_color=”#214C64″ header_4_text_color=”#358AAF” custom_padding=”30px|15px|30px|15px|true|true” global_colors_info=”{}”]<\/p>\n

Reach out to ZPE Systems for more help comparing end-of-row vs. top-of-rack deployments or to see a demo of the Nodegrid platform in action.<\/b><\/p>\n

[\/et_pb_text][et_pb_button button_url=”https:\/\/zpesystems.com\/contact\/” url_new_window=”on” button_text=”Contact Us” button_alignment=”center” _builder_version=”4.27.2″ _module_preset=”default” button_font=”||||||||” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"

Learn the difference between end-of-row vs. top-of-rack data center architectures and how to make either deployment more resilient.<\/p>\n","protected":false},"author":5,"featured_media":227130,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","content-type":"","footnotes":""},"categories":[32,87,88,101,84,82,83,99,169,100],"tags":[],"class_list":["post-227128","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-datacenter-management","category-data-center-resilience","category-failover-connectivity","category-minimize-impact-of-disruptions","category-monitoring-reporting","category-out-of-band-management","category-power-management","category-remote-network-management","category-serial-consoles","category-streamline-deployments"],"yoast_head":"\nEnd of Row vs Top of Rack Deployments - ZPE Systems<\/title>\n<meta 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Baker","author_link":"https:\/\/zpesystems.com\/author\/jordan\/"},"rttpg_comment":0,"rttpg_category":"<a href=\"https:\/\/zpesystems.com\/category\/datacenter-management\/\" rel=\"category tag\">Data Center Management<\/a> <a href=\"https:\/\/zpesystems.com\/category\/minimize-impact-of-disruptions\/data-center-resilience\/\" rel=\"category tag\">Data Center Resilience<\/a> <a href=\"https:\/\/zpesystems.com\/category\/minimize-impact-of-disruptions\/failover-connectivity\/\" rel=\"category tag\">Failover Connectivity<\/a> <a href=\"https:\/\/zpesystems.com\/category\/minimize-impact-of-disruptions\/\" rel=\"category tag\">Minimize Impact of Disruptions<\/a> <a href=\"https:\/\/zpesystems.com\/category\/remote-network-management\/monitoring-reporting\/\" rel=\"category tag\">Monitoring & Reporting<\/a> <a href=\"https:\/\/zpesystems.com\/category\/remote-network-management\/out-of-band-management\/\" rel=\"category tag\">Out of Band Management<\/a> <a href=\"https:\/\/zpesystems.com\/category\/remote-network-management\/power-management\/\" rel=\"category tag\">Power Management<\/a> <a href=\"https:\/\/zpesystems.com\/category\/remote-network-management\/\" rel=\"category tag\">Remote Network Management<\/a> <a href=\"https:\/\/zpesystems.com\/category\/serial-consoles\/\" rel=\"category tag\">Serial Consoles<\/a> <a href=\"https:\/\/zpesystems.com\/category\/streamline-deployments\/\" rel=\"category tag\">Streamline Deployments<\/a>","rttpg_excerpt":"Learn the difference between end-of-row vs. top-of-rack data center architectures and how to make either deployment more resilient.","_links":{"self":[{"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/posts\/227128","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/comments?post=227128"}],"version-history":[{"count":10,"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/posts\/227128\/revisions"}],"predecessor-version":[{"id":227387,"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/posts\/227128\/revisions\/227387"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/media\/227130"}],"wp:attachment":[{"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/media?parent=227128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/categories?post=227128"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zpesystems.com\/wp-json\/wp\/v2\/tags?post=227128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}