volume.config(5) on Linux
The text 27a261026352, as Debian 11 (Bullseye) shipped it.
Traffic Server cache volume configuration file The volume.config file enables you to manage your cache space more efficiently and restrict disk usage by creating cache volumes of different sizes. By distributing the cache across multiple volumes, you can help decrease single-lock pressure when there are not many hard drives present. You can further configure these volumes to store data from certain origin servers and/or domains in the hosting.config file.