OSI/MHS Configuration and Management Manual

Introduction to OSI/MHS
OSI/MHS Configuration and Management Manual—424827-003
1-15
Message Relay (MR) Group
•
Delivery of messages, and scheduling of messages for delivery
•
Submittal of messages
•
Routing of messages
•
Encoding and decoding of message headers
•
Report generation
•
Recovery
The MR process also manages associations, and it provides access management for
both the Message Transfer System (MTS) user and the gateway. The MR process is
multithreaded in that it allows simultaneous processing of messages.
Reliable Transfer Service (RTS) Process
The RTS process implements the OSI Reliable Transfer Service Element (RTSE)
protocol and accesses the PDU store to read and write messages. The RTS process is
a single, restartable process that provides the following functions:
•
Provides an interface to the OSI/AS services.
•
Transfers Application Protocol Data Units (APDUs) between MTAs.
•
Ensures that data is not lost or duplicated.
•
Stores information about each of the associations and related PDU transfers that it
is currently supporting.
•
Provides recovery capability for the associations and PDU transfers in the event of
an RTS process failure.
The RTS process is a multithreaded process in that it allows you to manage multiple
associations simultaneously.
Store Cleaner (SC) Process
The SC process is a restartable process that scans the PDU store at intervals. When it
finds a message that has been fully processed, it removes the message from the PDU
store. (A message is fully processed when it has been delivered to all its recipients.)
MR PDU Store
Each MR group has one PDU store. The PDU store consists of a data file and a log
file. The data file contains the protocol data units for the P1 messages. The log file
contains records that indicate the processing steps taken on specific PDUs. These files
are created for each MR group during the installation procedures (described in
Section 4, Installing Your OSI/MHS Subsystem and are configured into the OSI/MHS
subsystem through SCF commands. The MR PDU store helps implement the store-
and-forward function of the MR group.