OSI/MHS Configuration and Management Manual

Introduction to OSI/MHS

OSI/MHS Configuration and Management Manual—424827-003

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Local Operations Service (LO) Group

When a user wants to retrieve a message, the MS group finds the message in the

message store and tells the LO group where to find it. The body of the message does

not go through the MS group; the LO group accesses it directly from the MS PDU store

and sends it to the user.

When a user submits a message, the message request goes to the MS group, which

allocates a PDU ID. Then the LO group writes the message directly into the MS PDU

store. The MS group then forwards the message to an MR group.

Figure 1-11 shows an LO group.

An LO group contains the following:

•

Local operations service (LO) process

•

LO PDU store

An OSI/MHS subsystem can have zero, one, or more LO groups. If the subsystem

includes MS groups, it must have at least one LO group.

Note. A PDU ID is generated by OSI/MHS for internal use by OSI/MHS processes only. This

PDU ID is not the same as the MPDU ID defined by X.400.

Figure 1-11. Local Operations (LO) Service Group

052VST

.VSD

OSI/MHS Subsystem

LO Group

LO PDU

Store

OSI/AS

MS Groups

MR Groups