@ Asker 07:57 Mar 16, 2021
No, it's nothing about speed!
In technical fields, we often talk about e.g. a 'hot spare' — a duplicate piece of equipment, fully operating and ready to take over immediately ('à chaud') should the main equipment fail.
We likewise talk about a 'cold spare' — a piece of equipment standing by in case needed, but not always powered up and actually running, so might involve a certain time to get up and running.
I'm not familiar with the use of 'warm', but the meaning is obvious enough: a piece of equipment that is standing by ready to take over, probably already powered, but not actually operating; thus the start-up time from standby will be shorter. | 
peer agreement (net): -1
