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Configuration Procedure
139
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/MVS 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.
For printing on TCP/IP-attached printers, IBM recommends that you
specify a shorter interval than the default, such as 10 minutes, for the
interval between keep-alive transmissions.
Also, if any target host requires that the keep-alive packet contain data,
specify SENDGARBAGE TRUE. For example:
KEEPALIVEOPTIONS INTERVAL 5 SENDGARBAGE TRUE ENDKEEPALIVEOPTIONS
GATEWAY
The Packet Size parameter of the GATEWAY statement defines the
maximum transmission unit (MTU) for the MVS host. For IBM 6400
printers, the MTU size is fixed at 1024 bytes. The value cannot be
adjusted.