Thanks bp2008 and biggen, organization and planning makes a huge difference in system performance and maintenance.
even weight distribution in equipment rack placement is important.
all outlets are identified and assigned on the power controllable server,
network wiring
network logical topology vlans etc
as well as having a landing webpage with all the networked management devices and services directory links.
the back of the rack has ir sensor with full led bars to automatically iluminate each rack workspace.
and of course a dossier document with all access information, very useful when you have dozens of Virtual machines, IoT, services etc.