Tuning Your DTC [ Configuring Systems for Terminals, Printers, and Other Serial Devices ] MPE/iX 5.5 Documentation
Configuring Systems for Terminals, Printers, and Other Serial Devices
Tuning Your DTC
This section describes the steps for tuning your DTC by selecting the
AFCP, TCP and management timers that are appropriate for your DTC and
network traffic. The timer selection is made by choosing a set from a
predefined set of timer values. The TCP timers are only used for
back-to-back connections from switched DTC ports.
Figure 8-2 displays the Tune DTC - Timer Configuration screen. This
screen is reached by pressing [F2], the [Tune DTC] function key at the
DTC Configuration screen. See the beginning of this appendix to find out
how to access the [Tune DTC] function key.
The Tune DTC - Timer Selection screen for host-based management is shown
below. The screen for PC-based management contains only the AFCP timer
selection. For PC-based management the TCP and management timers are
configured on the DTC OpenView workstation.
Click here to view figure.
Figure 8-2. Tune DTC - Timer Selection Screen
1. The DTC name field is a display field and shows the name of the
DTC you are currently configuring.
2. Select one of six predefined sets of values for AFCP timers. The
default is selection 1.
3. Select one of five predefined sets of TCP timer values. The
default is 1.
4. Select one of two predefined sets of values for management timer.
The default is selection 1. The management protocol timers
determine different transmission algorithms.
5. After you have selected the desired timer values, press the [Save
Data] key.
6. Press the [Prior Screen] key to return to the DTC Configuration
screen, or press [Validate DTS/LINK] to validate your
configuration if you have completed configuration for your DTCs.
_________________________________________________________________
NOTE If you changed your network configuration, you need to
validate the configuration and cross-validate with SYSGEN
before you exit NMMGR. Refer to chapter 5 for information on
these steps.
_________________________________________________________________
For host-based management, after you invoke dynamic configuration, both
host and DTC values will take effect once you logoff any sessions or stop
and restart the spooler associated with changed devices and download the
DTC. For PC-based management, only the host values will take effect
because the DTCs are managed by the OpenView DTC Manager on the PC. You
must use the OpenView DTC Manager to configure and download the DTC timer
values. In this case, you must ensure consistency of timer selections
between the host and the DTC during configuration in NMMGR and OpenView
DTC Manager.
Fields
AFCP Timer Set 1 Normal timer mode. This selection is appropriate
for most users operating in a normal LAN
environment.
AFCP Timer Set 2 Short retransmission timer mode. This is
appropriate in a LAN environment where there is a
high number (greater than 1%) of packets lost on
the LAN. The values are adapted to provide shorter
retransmission values and higher number of retries.
AFCP Timer Set 3 Long retransmission timer mode. This is
appropriate in a LAN environment where the LAN is
very reliable. The values are adapted to reduce
LAN traffic and host driver overhead.
AFCP Timer Set 4 Variable retransmission timer mode. This is
appropriate in exceptional cases where there is a
very high percentage of lost packets on the LAN.
The values are adapted to prevent saturation of the
LAN.
AFCP Timer Set 5 MPE XL release 1.2 timer mode. This is appropriate
for use with HP 3000 MPE XL FOS release 1.2.
AFCP Timer Set 6 MPE XL release 2.1 timer mode. This is appropriate
for use with HP 3000 MPE XL FOS release 2.1.
TCP Timer Set 1 Normal timer mode. For local transaction
processing applications and Telnet connections on
local LAN.
TCP Timer Set 2 Bridge timer mode. Same mode as Set 1 but with
bridges. Suitable for LANs with moderate delays.
TCP Timer Set 3 Router/X.25 timer mode. Same mode as Set 1 but
with routers or X.25. Suitable for LANs with
longer delays.
TCP Timer Set 4 High data loss timer mode. Suitable for networks
with high data losses.
TCP Timer Set 5 Heavy traffic timer mode. Suitable for extended
switching applications on local LAN or with bridges
where there is heavy traffic.
Management Timer Set Normal traffic mode. This is appropriate in a LAN
1 environment with normal traffic
Management Timer Set Busy LAN mode. This is appropriate in a LAN
2 environment with busy traffic.
MPE/iX 5.5 Documentation
HP 3000 Manuals