What NOT to do in your server room
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Leave unused cables in-place. Do not use cable management. Leave no cable unlabeled.

Use cables of appropriate length (this is a SCSI cable!):
Plug your most critical servers and SAN into a small stand-alone UPS instead of the large, redundant, UPS battery backup:
Keep old and dead equipment in the rack:

Use the aisle in front of your server racks for old PC storage:

Run cables through unusual pathways that require un-racking servers to move a cable:
Stack equipment back-to-back and resting on top of each other:

