A /krb5/v5srvtab keytab file is stored on the local disk of each File Server machine. A keytab file contains the list of server encryption keys used by a server process on that machine to decrypt tokens presented by clients. The server process interacts only with clients possessing tokens encrypted with server encryption keys listed in the appropriate keytab file.
The keys in a keytab file are marked with a unique key version number. All tokens presented by clients are also marked with a key version number; a server process uses the key version number to determine which key to use to decrypt a token.
Only administrative users can examine, add, and remove keys in the keytab file. Never edit a keytab file directly; always use the appropriate bos commands.