We rarely mark the patch cords in a data closet. If we do we mark them, it is only on the patch rack end so that the cable stays with the link it was originally tested on. I suppose you could mark the other end as well with the same designation, but it seems relatively easy to just tug and trace in most installations.
Many of my customers have a spreadsheet that they say they keep updated showing each switch connection, patch panel port, workstation location, user, IP address, etc. Makes it a bit easier if Sally Smith calls and says she is having trouble. A quick look on the spreadsheet and you can find her patch panel port and switch port.
It does depend on the size and type of operation. If they are making moves and changes often, and labeling will change, I find that often the customer won't keep up with that. Only thing worse than no label....is the wrong label.
Good Luck!
It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com