Axis 5570e User Manual page 85

AXIS 5570e/AXIS 5670e User's ManualSection 5: Setting Up - IBM Mainframe (zSeries)
Statement
DATABUFFERPOOLSIZE
SMALLDATABUFFERPOOLSIZE
TINYDATABUFFERPOOLSIZE
KEEPALIVEOPTIONS
GATEWAY
The table below provides more information about the statements.
Explanation
Defines the number and size of the data buffers. It is recommended that you specify at least 160
data buffers and a buffer size of 32768 bytes
Defines the number of small data buffers. It is recommended that you specify at least 256 small
data buffers
Defines the number of tiny data buffers. It is recommended that you specify at least 256 tiny
data buffers
PSF relies on TCP to detect when a connection with a TCP/IP-attached printer or an AXIS
5570e/AXIS 5670e is no longer available. 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.
We recommend 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 on you network requires that the keep-alive packet contains data, specify
SENDGARBAGE TRUE
The Packet_size parameter of the GATEWAY statement defines the maximum transmission unit
(MTU) for the MVS host. The MTU size must not exceed the maximum size that can be sent
through the control unit; if it does, transmission problems will occur.
The MTU size should be 2000 bytes and the MTU size for the MVS host should be the same as the
MTU size for the printer.
For values in the GATEWAY statement other than the packet size, specify the values that are
correct for your installation.
For more information about the TCP/IP profile and the statements
described in this section, please refer to:
• IBM TCP/IP MVS Customization and Administration Guide
• IBM TCP/IP Performance and Tuning Guide
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