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Teaching Case — Two Devices in One Unit

Two devices declared at U 20, in a rack where everything else is spaced correctly. Drawn by any tool that draws what it is handed, the second is painted over the first at full width and the first disappears — so the figure shows seven devices where the document declares eight, in a plausible slot with a plausible label, and nothing anywhere says a device is missing. Here they are drawn side by side in the unit they contend for, ringed, and the panel names both.

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Rack B2 — mixed load24U · 9 free242322212019181716151413121110987654321Patch panelToR switchFirewallCompute node 01Compute node 02Storage shelfTape libraryUPS2 devices cannot be mounted as this document places them.ERROR`Compute node 01` and `Compute node 02` both claim U 19–20, and only one of them can be there. They are drawn side byside here so the figure shows what the document declares; every tool that draws what it is handed paints them in declarationorder at full width, so the last covers the other completely — a rack showing 1 fewer device than the document declares, in aplausible slot with a plausible label.

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title "Rack B2 — mixed load"
units 24

device "Patch panel"      at 24 height 1
device "ToR switch"       at 23 height 1
device "Firewall"         at 22 height 1

device "Compute node 01"  at 20 height 2
device "Compute node 02"  at 20 height 2

device "Storage shelf"    at 14 height 4
device "Tape library"     at 8  height 4
device "UPS"              at 3  height 2