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Teaching Case — A Device That Reaches Past the Rack

A 4U storage shelf placed at U 3, which reaches down to U 0 — a unit that does not exist — and a switch placed at U 30 in a 24U cabinet. The renderer this replaces clamped the top unit with `Math.min(units, at)`, so in a 12U rack a device at U 12, at U 20 and at U 99 produced byte-identical SVG: the author's mistake silently corrected into a drawing of a rack they never described. Neither device is drawn mounted here; both appear in a marked strip beside the frame, at the unit they claim.

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Rack C3 — install plan24U · 18 free242322212019181716151413121110987654321Patch panelCompute nodePDUDeclared outside this 24U rackToR switchat U 30Storage shelfU 0–33 devices cannot be mounted as this document places them.ERROR`ToR switch` is mounted at U 30, above the top of a 24U rack. The renderer this replaces clamped silently, so a device past theend of the rack was drawn AT the end and the figure was byte-identical to a correct one — the author's mistake corrected intoa drawing they never described. Devices that cannot be mounted are not drawn mounted here; they are in the strip beside therack, at the unit they claim.ERROR`Storage shelf` is 4U mounted at U 3, so it reaches U 0 — and a rack has no unit below 1.ERROR`Storage shelf` and `PDU` both claim U 1, and only one of them can be there. `Storage shelf` does not fit this rack at all, so it isin the strip beside it rather than in this row — the clash is real even so, and it is the reason this unit is hatched.

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title "Rack C3 — install plan"
units 24

device "Patch panel"     at 24 height 1
device "ToR switch"      at 30 height 1
device "Compute node"    at 20 height 2
device "Storage shelf"   at 3  height 4
device "PDU"             at 1  height 1