TMF Glossary (G06.24+)

TMF Glossary
HP NonStop TMF Glossary—522415-002
Glossary-13
Pathsend facility
Pathsend facility. A set of NonStop Kernel operating system procedure calls and the
LINKMON process, which work together to provide general access to Pathway server
classes from any process on a NonStop system.
Pathway/TS. An HP product that provides tools for developing and interpreting screen
programs to support OLTP applications in the NonStop Kernel operating system
environment on NonStop systems. Pathway/TS screen programs communicate with
terminals and intelligent devices. Pathway/TS includes the TCP, the SCREEN COBOL
interpreter and run-time environment, and the SCREEN COBOL Utility Program
(SCUP). It requires the services of the NonStop TS/MP product. See also NonStop
Transaction Services/MP (TS/MP).
physical file name. The internal file name that the DP2 disk process uses to identify any
file.
pinned file. An audit trail file that cannot be reused or purged from the active audit volume
because it contains or is receiving active audit information, it may be needed to recover
an active transaction, or it may be needed to restart TMF.
PIO. Packet I/O. PIO is like a message with a remote procedure call on the other end, with
the target being a cpu and interrupt service calling BUSRECEIVE-> TMFLibrary calls.
PIO buffering. The boxcarring of PIO messages to the delivery target, and unmarshalling at
the target in the proper order, to amortize the overhead of memory channel
transmissions on both ends by way of processor prefetch, sender dispatches,
communications, and interrupt service on the receiver end.
preallocated audit trail file. An allocated file used to guarantee that disk space configured
for the audit trail is not consumed by other applications. TMF eventually renames such
files as new audit trail files.
primary process. The currently active process of a process pair in the NonStop Kernel
operating system environment. See also process pair
.
procedure call. A method of invoking, from within a program, one of many system services.
Some of these services can be applied to TMF transactions.
process pair. A fault-tolerant arrangement of processes in the NonStop Kernel operating
system environment, whereby two processes in separate processors share the same
name and execute identical code. One process functions as the primary process and
the other functions as the backup process. The two processes are kept in sync through
checkpoint messages sent from the primary to the backup process. If the primary
process fails, the backup process is notified that it is now the primary, and it resumes
the application work from the last valid checkpoint message.