High Density Power Distribution Units (PDUs)

High density web scale compute requires a completely different approach to cooling, or more appropriately, the lack of cooling and using outside air. Similarly, it requires a different approach on how power is being managed and deployed within the rack. this article focuses on power distribution within a rack. There are several approaches to this and one such process is explained below.

Recommended process to be followed:

1. AC-3 Phase is mandatory to go into high density. It is efficient and scalable. It presents challenges such as balancing loads across ABC phases of a 3-phase circuit.

2. High Density Outlets (HDOs) are a must. Standard outlets cannot be used because it leads to a problem of form factors like cable management, operational issues or the standard outlets that simply end up using an expensive width on the rack space.

3. Alternating Phases within the outlets solve the problems of balancing the ABC-phases on a 3-phase circuit. It is better to solve the balancing of the phases in the rack, rather than at the upstream facility, RPP, Floor PDU or even at the floor level.

4. Measuring your load configuration at several intervals is important. There are several ways to solve this problem: Software, Hardware, Input Metering etc. Software is more prevalent now. Using IPMI interfaces to capture such information is better, more agile and granular.

5. Network Closets are populating with denser port counts.

6. Network Closets require lesser outlets, but more power. 10G, 40G, 100G and even 400G links, which are increasing fairly quickly means, you need to provide more power per port. Power must also be truly redundant. A failure in a Network Closet is much more expensive than a failure at a Server / Compute level.

7. High Density tap boxes can reduce the number of tap boxes by making the busway neater and by giving you the ability to add a lot of circuits into a single rack. Keeping these high level points in mind, here are some of the unique solutions.

1. 35.2KW 0U High Density 108 Outlet Rack PDU Configuration for Cabinet

2. 8.8KW 2U High Density 24 Outlet Rack PDU Configuration for Network Closet

3. 8.8KW 1U High Density 12 Outlet Rack PDU Configuration for Network Closet

There are basic challenges with lead times, in-time inventory and the ability to source these globally in various configurations for deployments. The best solution to overcome could be to stock the units in large volumes of at least 400+ unit quantities.

Source by Paul Weber

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