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Diagrams example

Rack A07, power draw by device

A 42U rack shaded by each device's power draw, with the key worked out from the numbers.

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In words

Everything on this diagram

The same content as the picture, as text: every part and what it says when you open it.

Patch panel

24 copper ports where the room's cabling lands before it reaches the switches.

Position
U42
Height
1U
Role
Passive
Power draw
None

Top-of-rack switch A

One of a redundant pair. Every server has a link to each, so either can fail without a server losing the network. Draws 180 W.

Position
U41
Height
1U
Role
Network
Power draw
180 W

Top-of-rack switch B

The second of the pair, on the other power feed. Draws 175 W.

Position
U40
Height
1U
Role
Network
Power draw
175 W

Cable manager

A brush strip that keeps the patch leads tidy - and the airflow clear.

Position
U39
Height
1U
Role
Passive
Power draw
None

Firewall

Filters traffic in and out of the rack's private network. Draws 120 W.

Position
U38
Height
1U
Role
Network
Power draw
120 W

Blanking panel

Empty space is covered so hot exhaust cannot loop back to the cold aisle through it.

Position
U36–U37
Height
2U
Role
Passive
Power draw
None

Compute node 01

A 1U server for the web and application tier, two processors and 512 GB of memory. Draws 310 W.

Position
U35
Height
1U
Role
Compute
Power draw
310 W

Compute node 02

A 1U server for the web and application tier, two processors and 512 GB of memory. Draws 345 W.

Position
U34
Height
1U
Role
Compute
Power draw
345 W

Compute node 03

A 1U server for the web and application tier, two processors and 512 GB of memory. Draws 290 W.

Position
U33
Height
1U
Role
Compute
Power draw
290 W

Compute node 04

A 1U server for the web and application tier, two processors and 512 GB of memory. Draws 410 W.

Position
U32
Height
1U
Role
Compute
Power draw
410 W

Compute node 05

A 1U server for the web and application tier, two processors and 512 GB of memory. Draws 380 W.

Position
U31
Height
1U
Role
Compute
Power draw
380 W

Compute node 06

A 1U server for the web and application tier, two processors and 512 GB of memory. Draws 265 W.

Position
U30
Height
1U
Role
Compute
Power draw
265 W

Compute node 07

A 1U server for the web and application tier, two processors and 512 GB of memory. Draws 335 W.

Position
U29
Height
1U
Role
Compute
Power draw
335 W

Compute node 08

A 1U server for the web and application tier, two processors and 512 GB of memory. Draws 300 W.

Position
U28
Height
1U
Role
Compute
Power draw
300 W

Blanking panel

Kept free for two more compute nodes.

Position
U26–U27
Height
2U
Role
Passive
Power draw
None

GPU server

Eight accelerators for model training. On its own it draws more than five of the compute nodes together, which is why it sits low, near the cool floor air. Draws 1,650 W.

Position
U22–U25
Height
4U
Role
Compute
Power draw
1,650 W

Blanking panel

A gap left for the GPU server's cabling.

Position
U21
Height
1U
Role
Passive
Power draw
None

Database server 01

A 2U database server with twelve NVMe drives, one of a cluster of three. Draws 560 W.

Position
U19–U20
Height
2U
Role
Compute
Power draw
560 W

Database server 02

A 2U database server with twelve NVMe drives, one of a cluster of three. Draws 610 W.

Position
U17–U18
Height
2U
Role
Compute
Power draw
610 W

Database server 03

A 2U database server with twelve NVMe drives, one of a cluster of three. Draws 530 W.

Position
U15–U16
Height
2U
Role
Compute
Power draw
530 W

Storage array

Twenty-four drives in a redundant array: the rack's shared storage. Draws 680 W.

Position
U11–U14
Height
4U
Role
Storage
Power draw
680 W

Blanking panel

Spare space above the backup appliance.

Position
U10
Height
1U
Role
Passive
Power draw
None

Backup appliance

Takes a nightly copy of the storage array and keeps thirty days of it. Draws 290 W.

Position
U8–U9
Height
2U
Role
Storage
Power draw
290 W

KVM console

A fold-out screen and keyboard for working on any server in the rack in person. Draws 30 W.

Position
U7
Height
1U
Role
Power and management
Power draw
30 W

Blanking panel

Space above the UPS, left clear for its heat.

Position
U4–U6
Height
3U
Role
Passive
Power draw
None

UPS

Keeps everything running for the few minutes it takes the building's generator to start. It carries the load rather than drawing it, so it is not shaded.

Position
U1–U3
Height
3U
Role
Power and management
Power draw
None

PDU A

The power strip on feed A. Every device with two power supplies takes one from each strip, so either feed can fail without anything going dark.

Feed
A
Outlets
20

PDU B

The power strip on feed B. Every device with two power supplies takes one from each strip, so either feed can fail without anything going dark.

Feed
B
Outlets
20
Diagrams

Seat maps, org charts, process maps and racks: every shape becomes a region.

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