The summary.
PLAN THE RACK BEFORE INSTALLING ANYTHING
Heavier equipment lower, nothing obstructing airflow, space left for growth.
An unplanned rack becomes impossible to maintain and impossible to cool.
VERIFY REMOTE MANAGEMENT WORKS BEFORE YOU LEAVE THE BUILDING
Otherwise the next problem requires another visit.
Check both power supplies are live and on separate paths while you are there.
SET UP OUT-OF-BAND ACCESS IN ADVANCE
Configuring it during an outage is not possible. And never expose management interfaces to the internet — they are complete control.
LABEL BOTH ENDS OF EVERY CABLE, DURABLY
Handwritten tape fails within a year, and then nothing is identifiable.
Use the same name in the label, the inventory and the monitoring, so an alert names something findable.
HOLD SPARES FOR ANYTHING WHOSE REPLACEMENT TIME IS UNACCEPTABLE
Import lead times make this matter more here than elsewhere. Test a spare before relying on it.
WHEN DECOMMISSIONING, REMOVE EVERYTHING
Cables, labels, firewall rules, monitoring entries and inventory records — and fit blanking panels in the vacated units.
NEVER PROP OPEN A DOOR THAT SHOULD BE CLOSED
It defeats both security and containment.
