Velcro. Velcro velcro VELCRO. custom cut length hook/loop with electricians scissors.
I have a tech that insists on using zip ties,its the bane of my existence.
From the standpoint of network rack org, theres a lot of opinions, but it depends on what you're doing and what you have to work with. In a perfect "I'm never touching this again" world, you use custom cut to length cables and build them in a bunch from the closest to the farthest so they form sort of a.. _| | | type of pattern. (wait, I cant underline in this editor?)
If you plan to change anything, I recommend cable trays. Use longer cables and color code to make them easier to trace out. I say use longer ones so you can build them out (on a 48 port I do top to top, bottom to bottom, or, if there's 2 48s together, 24 left, 24 right.)
I'm having a dumb, so the word escapes me, but I like the large cable org stacks that run up either side of the front and back of a network rack. They enable you to pull the excess cable in and bundle it in a large bundle.
"They're talking about servers fox."
yea.. so most of that still applies to the network cables on the servers, BUT, your power cords can get really hairy and become a nice fire/shock hazard if you're not careful.
In my experience, the best workaround I've been able to get with power is to run short cables that can click in where they need to (usually a vertical power distribution strip on one side, a dense one, that runs to a ups OR, 2 of them that run to 2 ups's if you want/need that level of redundancy.) Running the stock 6-8' cables that come with the servers is a good way to have a giant mass of black worms at the bottom/side of your cabinet that you can't really even work with.
You want it neat, but you also want to be able to un/re rack your servers when a fan, or a write cache battery or dimm goes bad on you WITHOUT risking shocking yourself. (speaking from experience there..)