XFOR: Host Messages Backed Up on OV/VM Connector

• Microsoft Exchange Server, version 5.5

SYMPTOMS

Messages on the host may be stuck in the Remote Spooling Communications Subsystem (RSCS) queue even though the Microsoft Exchange OfficeVision/VM (OV/VM) Connector is working properly. Stopping and then restarting the Exchange OV/VM Connector clears the backlog.

CAUSE

The RSCS link definition for the Microsoft Exchange Server VM Node may be incorrectly configured for multiple threads. The Exchange OV/VM Connector supports only one thread.

RESOLUTION

Contact your local VM administrator, who has access to the host mainframe.

1. Open the RSCS configuration file.



2. Ensure that the STREAMS or ST parameter is set to 1. For example:

   PARM RSCSLINK BUFF=3072 ST=1 TA=0

   The default for RSCS communications between OV/VM systems is for multiple threads.



3. You must restart the RSCS system for any changes to take effect.

MORE INFORMATION

The following information is documented in Microsoft Exchange Connector for IBM OfficeVision/VM Installation and Configuration in Chapter 2:

RSCS PARM Statement

The following table describes the PARM statement you need for the link.

NOTE: Do not set the RLPASS, RNPASS, TLPASS, and TNPASS parameters in this statement. If you do, the connector cannot sign on to the host. You can allow other parameters to default.

RSCS PARM Statement Definition

Parameter	Value	Description
BUFF	1024	The maximum size RU (Request/Response Unit) this link can accept from VTAM. This value must fall within the range of 300 to 32765. The default is 1024. Increasing the buffer size results in more efficient data transmission because of reduced protocol handshaking.
STREAMS	1	The maximum number of files that RSCS can transmit simultaneously. The current version of the connector supports one simultaneous stream of data in each direction.
TA	0	The number of the transmission algorithm RSCS uses to determine how to select files for transmission. You must set this value to 0 to use IBM-supplied algorithms.

Additional query words: rscs.config

Keywords : exc55
Version : winnt:5.5
Platform : winnt
Issue type : kbprb