Technical data

Figure 2–3 Detached Tracing on VMS Systems and Remote Servers
TRACE
utility
Trace
file
Trace server
process
CTF
buffer
CTF$DCP
VMS
Control
CTF Manager
DEC WANrouter
Trace records
from remote
tracepoints
Trace records
from local
tracepoints
VMS System
Remote Server
2.3.2 CTF Support on Remote Servers
CTF support functions on a remote server are provided entirely by the operating
system. The operating system collects trace records and sends them to the local
VMS system from which the server is being traced, using a DECnet/OSI session
connection.
In the case of live tracing (see Figure 2–2), the TRACE utility establishes the
session connection to the remote server, and formats and displays the received
trace records on your terminal.
In the case of detached tracing (see Figure 2–3), the trace server process
establishes the session connection to the remote server, and writes the received
trace records to a trace file. The contents of the trace file can then be formatted
and displayed later.
In the case of snapshot tracing, trace records are buffered at the remote server
and are transmitted to a trace file or to the TRACE utility in response to a CTF
command.
2–6 Technical Overview