Controlling message traffic directed to an extended MCS console

This information explains how to control the number of messages queued to an extended console and the size of auxiliary storage that an extended console can use for the message data space.

• The STORAGE field in MCSOP specifies the size of the message data space created for the extended console. The range of the STORAGE field is from 1 to 2048, where 1 represents 1 megabyte of data space storage and 2048 represents 2048 megabytes, or 2 gigabytes, of data space storage. The default for STORAGE is 1. The number of messages going to your data space is limited by storage size. If you want to further control the number of messages going to your data space, use the QLIMIT parameter.
• The QLIMIT parameter on the MCSOPER macro specifies the maximum number of messages queued to an extended MCS console. The value can range from 1 to 2147483647 (2 billion). The default for QLIMIT is 2147483647. Taking the default might cause you to run out of storage in the message data space.
• The ALERTPCT parameter on the MCSOPER macro specifies a percentage of the QLIMIT value. When the number of messages queued to an extended MCS console exceeds the number represented by this percentage, the system alerts the extended MCS console by posting an ECB, identified by the ALERTECB parameter. For example, if the QLIMIT value is 2000, and the ALERTPCT value is 50, the system alerts the extended MCS console user when the number of messages in the message data space exceeds 50%, or 1000 messages, of the QLIMIT.