IBM 6500 Databufferpoolsize, Smalldatabufferpoolsize, Tinydatabufferpoolsize, Keepaliveoptions

Chapter 10 Configuring PSF for z/OS to Print IPDS Files

For information about the TCP/IP profile and the statements described in this section, refer to:

•IBM TCP/IP z/OS Customization and Administration Guide

•IBM TCP/IP Performance and Tuning Guide

DATABUFFERPOOLSIZE

The DATABUFFERPOOLSIZE statement defines the number and size of the data buffers. For printing on TCP/IP-attached printers, IBM recommends that you specify at least 160 data buffers, 32768 buffer size.

SMALLDATABUFFERPOOLSIZE

The SMALLDATABUFFERPOOLSIZE statement defines the number of small data buffers. For printing on TCP/IP-attached printers, IBM recommends that you specify at least 256 small data buffers.

TINYDATABUFFERPOOLSIZE

The TINYDATABUFFERPOOLSIZE statement defines the number of tiny data buffers. For printing on TCP/IP-attached printers, IBM recommends that you specify at least 256 tiny data buffers.

KEEPALIVEOPTIONS

PSF relies on TCP to detect when a connection with a TCP/IP- attached printer is no longer usable. When no data has been exchanged between PSF and its connection partner, TCP sends keep-alive probes to the connection partner periodically. These periodic probes, called keep-alive transmissions, enable TCP to discover when a connection is no longer usable even if the connection partner is abruptly powered off or is no longer accessible through the network.

The frequency of keep-alive transmissions is controlled by the INTERVAL parameter on the KEEPALIVEOPTIONS statement. The frequency applies to all TCP applications that direct TCP to send keep-alive transmissions. The default frequency is after about two hours of inactivity.

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