Xerox 180 IPS manual Correcting for printer performance issues MVS, Problems, Lan

DEFINING THE PRINTER TO THE HOST: TCP/IP ATTACHMENT

Correcting for printer performance issues – MVS

	Should you notice any printer performance problems—e.g., through-
	put speed degradation, check the areas listed in the following table.
	Table E-11.Components to check for printer performance
		problems
MVS		On the MVS system, ensure that both the PSF and TCP/IP
		address spaces are receiving a high level of service, are at a high
		dispatching priority, and their datasets and the JES2 spool
		datasets are on DASD volumes that have low competing activity
		from other applications and from other DASD volumes on the
		same path.
Printer		Ensure that the Maximum Transmission Unit size (MTU) is as
		large as possible. A small MTU size increases the number of
		packets that are transmitted, allowing greater chances of
		degradation throughout the network. Increasing the MTU size in
		both TCP/IP for MVS and in the IPS printer may improve printer
		performance.
LAN		If the printer is on a LAN that also has a large number of other
		devices attached to it, the high levels of traffic on the LAN can
		cause printer speed degradation. Consider moving the printer to
		a LAN that does not have so much activity on it.
LAN-to-host		If the speed of the link connecting the LAN with the printer
attachment		attached to the MVS system is slow, this could be a bottleneck.
		This could be a concern with any configuration in which the LAN-
		attached controller (i.e., 3745, 3172, or 3174) is not directly
		channel-attached to the host running PSF. This could occur in a
		Remote LAN configuration as discussed in the Network
		Configurations section, earlier in this chapter. Review your
		network configuration diagrams to look for any potential
		bottlenecks.

E-16 XEROX DOCUPRINT 96/4635/180 IPS INSTALLATION PLANNING GUIDE