This section describes the configuration displays which include communications support. This includes the following displays:
v Work with Communications Resources v Create Multifunction IOP
v Create IOP
v Create Communications Line Resource
BEST/1 supports I/O adapters (IOAs). BEST/1 recognizes that only multifunction IOPs can connect to IOAs. All disk IOPs, all communications IOPs, and some multifunction IOPs cannot connect to IOAs. As in previous versions, BEST/1 shows communications lines connected directly to communications IOPs and multifunction IOPs that do not support IOAs. Multifunction IOPs that do support IOAs show connections to IOAs, and these IOAs show connections to the
communications lines.
To determine which multifunction IOPs allow connections to IOAs, go to the More BEST/1 Options menu and select option 10 to work with hardware characteristics.
Then select option 6 to work with multifunction IOP features. This display shows the maximum number of both disk and communications IOAs allowed for each multifunction IOP feature.
The other display relates to non-multifunction IOPs and multifunction IOPs that do not support IOAs. Likewise, if a communications IOP is already connected to a line, you cannot change its feature to a multifunction IOP that supports IOAs. For
Specify Connections to Comm IOPs CPU M odel . . . : B10
System Unit . . . : 9404
Type changes, press Enter. To remove a connection to a Comm IOP feature, set Max Lines to 0. This will not affect the characteristics of the Comm IOP feature.
Max number of LAN IOPs . . . . 1 Max number of WAN IOPs . . . . 2 Max number of WAN lines . . . . 8
Max ---Line Speed--- IOP Currently Feature Lines Minimum Maximum Type Available
2507 2 .3 19.2 *WAN N
2625 1 10000.0 10000.0 *LAN N
2636 1 4000.0 16000.0 *LAN N
6160 1 4000.0 16000.0 *LAN N
Bottom Currently Available: Y=Yes, N=No
F3=Exit F9=Add IOP feature F12=Cancel
Figure 129. Specify Connections to Comm IOPs
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some functions, there is a separation between IOPs that support IOAs (always multifunction IOPs) and IOPs that do not support IOAs. When you are changing a configuration, there are parallel displays for selecting IOP features and creating IOPs. One display relates to multifunction IOPs that support IOAs. The other display relates to non-multifunction IOPs that do not support IOAs.
To access the configuration menu for communications, take the following steps:
1. From the BEST/1 for the AS/400 display select option 1 (Work with BEST/1 Models) and press the Enter key. The Work with BEST/1 Models display appears.
2. Type a5 (Work with) in the Opt column next to the model you want to use and press the Enter key. The Work with BEST/1 Model menu appears.
3. Select option 10 (Configuration menu) and press the Enter key. The Configuration display appears.
Work with BEST/1 Model Performance data . . . : QPFRDATA (Q922590800) Model/Text . . . : TEST
Select one of the following:
1. Work with workloads
2. Specify objectives and active jobs 5. Analyze current model
6. Analyze current model and give recommendations 7. Specify workload growth and analyze model 10. Configuration menu
11. Work with results Selection or command
===> 10
F3=Exit F4=Prompt F9=Retrieve F12=Cancel F15=Save current model F17=Analyze with ANZBESTMDL F22=Calibrate model F24=More keys Model TEST has been read
Figure 130. Work with BEST/1 Model Menu
The Configuration menu enables you to work with all the configuration elements in the current model, such as CPU models, disk resources, storage pools, and communications resources.
4. Select option 5 (Work with communications resources). The Work with Communications Resources display appears, as shown in Figure 132.
This display shows all the IOPs that can support communications activities, as well as communications IOAs, and line resources in the current configuration.
You can create or change communications resource parameters. These
Configuration Select one of the following:
1. Change CPU and other resource values 2. Work with disk resources
3. Edit ASPs
4. Edit main storage pools
5. Work with communications resources Selection or command
===>
F14=Replace with saved configuration F15=Save current configuration F20=More BEST/1 options F24=More keys
BEST/1 CPU model 830 23DE refers to IBMCPU model 830 2403-1537
Figure 131. Configuration Menu
Work with Communications Resources Type options, press Enter.
2=Change 3=Copy 4=Delete 7=Rename 8=Create line resources
Nbr of Line Speed Pct Line
Opt Resource Feature Lines Type (Kbit/sec) Overhead
CC01 2619 *IOP
LANLINE1 1 *LINE 4000.0 2.0
CC02 2623 *IOP
WANLINE1 6 *LINE 56.0 2.0
CMB01 9164 *MFIOP
QESLINE 1 *LINE 19.2 2.0
Bottom F3=Exit F6=Create IOP F12=Cancel
Figure 132. Work with Communications Resources
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parameters include the IOP feature, its average LAN or WAN service time, line speed, and the number of lines connected to each IOP and IOA.
Note: In BEST/1, a line resource represents one or more communications lines, all of which have the same line speed. Consequently, a communications IOP and IOA can connect to one or more line resources.
5. To create an IOP for communications activity, press F6 (Create IOP). You see either the Create Multifunction IOP display (Figure 133) or the Create IOP display (Figure 134).
Create Multifunction IOP
Type information, press Enter. Line resources with 0 lines are not created.
IOP . . . . Name IOP feature . . . . F4 for list LAN service time . . . . .0 Msecs per frame WAN service time . . . . .0 Msecs per frame IOA . . . . Name
IOA feature . . . . F4 for list Service time . . . . .0 Msecs per frame Line Nbr of Line Speed Pct Line Frame Size
Resource Lines (Kbit/sec) Overhead (Bytes) Duplex
Bottom Duplex: *HALF, *FULL
F3=Exit F4=Prompt F6=Create line resource F11=Create IOP F12=Cancel
Figure 133. Create Multifunction IOP
Create IOP
Type changes, press Enter. Line resources with 0 lines are not created.
IOP name . . . .
Feature . . . . F4 for list LAN service time . . . . .0 Msecs per frame WAN service time . . . . .0 Msecs per frame Line Nbr of Line Speed Pct Line Frame Size
Resource Lines (Kbit/sec) Overhead (Bytes) Duplex
Bottom Duplex: *HALF, *FULL
F3=Exit F4=Prompt F6=Create line resource F11=Create Multifunction IOP F12=Cancel
Figure 134. Create IOP
Note: F11 (Create Multifunction IOP) is only displayed on the Create IOP display when the CPU model in your BEST/1 model can connect to at least one multifunction IOP that can in turn connect to communications IOAs.
You can attach one or more communications lines to the current
communications IOP or IOA with the average line speed that is specified in kilobits per second.
Fill in the necessary parameters for the communications IOP and possibly IOA, such as name, feature, and service times. You also need to fill in information for the first line resource that is displayed. Examples of this information are the number of lines that the line resource represents and an indication as to whether the data is sent half duplex or full duplex.
Pct Line Overheadrepresents the amount of noninformation bytes that aresent over a line resource, expressed as a percentage of the information bytes. For example, if 800 information bytes and 200 noninformation bytes are transferred, the overhead is 25%.
Depending on the type of line, noninformation bytes could represent items such as protocol overhead, or error transmissions. A high value for line overhead may indicate error conditions.
Notes:
a. For lines with less than 10% utilization, the default value for Pct Line Overhead is 2%.
b. As the traffic on the line increases, the percentage value for Pct Line Overhead remains the same. Therefore, whether 800 or 8000 information bytes are transferred, if the value for Pct Line Overhead is set to 5%, it will remain at 5%.
The average size of the information frame that is transferred across the line during the measurement interval determines the frame size. If more frames are transferred, the result is higher IOP (and possibly IOA) utilization.
Duplexrepresents half or full duplex lines. Half duplex lines can only send or receive data at any one time, whereas full duplex can both send and receive at the same time. This means that using full duplex can double the actual line speed of the line. The reason is that data can flow in either direction at the current line speed.
6. Press F6 (Create line resource) to add additional line resources to this new communications IOP (and possibly IOA).
7. To add line resources to an existing communications IOP, select option 8 (Create line resources) on the Work with Communications Resources display to access the Create Communications Lines display, as shown in Figure 135 on page 170.
Chapter 8. Selected Modeling Topics 169
8. To change characteristics of a communications IOP or IOA or a line resource, select option 2 next to the element you want to change on the Work with Communications Resources display, shown previously.