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ERserver
iSeries
Networking
iSeries Communications Management
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ERserver iSeries Networking iSeries Communications Management
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© Copyright International Business Machines Corporation 1998, 2001. All rights reserved. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
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Contents Part 1. Getting started with AS/400 communications .............. 1 Chapter 1. Print this topic .............................3 Chapter 2. Configuring AS/400 for communications...................5 Creating a network interface description ........................5 Creating a network server description .........................5 Creating a line description..............................5 Chapter 3. Optimizing communications performance ..................7 Improving wide area network perform
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Matching AS/400 parameters for a 5494 connected by frame relay .............46 Matching AS/400 parameters for a 5494 connected by SDLC ...............48 Matching AS/400 parameters for a 5494 connected by X.21................52 Matching AS/400 parameters for a 5494 connected by X.25................54 Matching AS/400 parameters for 3x74 controller .....................58 Matching AS/400 parameters for a 3174 controller ...................58 Matching AS/400 parameters for a 3274 controller ........
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Part 1. Getting started with AS/400 communications The AS/400 is an extremely versatile system for networking technologies, supporting a broad range of communication protocols. Protocols that are supported include TCP/IP, APPC, APPN, HPR, Remote workstation, asynchronous, and binary synchronous communications. AS/400 communications configuration is done by either manually or automatically creating a set of configuration objects that represent the local and remote systems that are to communicate.
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Chapter 1. Print this topic To view or download the PDF version, select Getting started with AS/400 communications (about 721 KB or 110 pages). To save a PDF on your workstation for viewing or printing: 1. Open the PDF in your browser (click the link above). 2. In the menu of your browser, click File. 3. Click Save As... 4. Navigate to the directory in which you would like to save the PDF. 5. Click Save. If you need Adobe Acrobat Reader to view or print these PDFs, you can download a copy from t
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Chapter 2. Configuring AS/400 for communications Follow these steps to configure your AS/400: 1. Depending on the type of hardware you have, you may need to refer to the following topics: v Creating a network server description v Creating a network interface description 2. You define lines by creating line descriptions. Depending on your hardware, the lines may be attached to a network server, or a network interface. Creating a network interface description Network interface descriptions for asy
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Chapter 3. Optimizing communications performance Many factors can affect the performance of AS/400 application programs. To achieve the best performance with your particular communications environment, you may want to review these topics: v Improving wide area network (WAN) performance. v Improving local area network (LAN) performance. v Improving data path performance. Improving wide area network performance To achieve better performance with your AS/400 when communicating in a wide area networ
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v For interactive environments, keep line use below 30% to maintain predictable and consistent response times. Exceeding 50% line use usually slows down response time. The line use can be measured with the AS/400 performance tools. v For large transfer environments, or for environments in which only a small number of users are sharing a line, increase line use to allow for acceptable response times. v The CPU usage for fractional T1 support and other high-speed WAN connections is similar to any
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processing a larger frame is only slightly more than the amount needed to process a smaller frame. If you use larger frames to transfer a single system message or block of data, decreases the total number of frames required to complete the transfer. v The values for IOP use in synchronous data link control (SDLC) environments do not necessarily increase consistently with the number of work stations or with the workload. An IOP can spend more time polling when the application is not using the lin
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parameter value on one system should never have a greater value than the LANMAXOUT parameter value on the other system. The parameter values of the sending system should match the values on the receiving system. v Setting appropriate values for the LANMAXOUT parameter along with the LAN acknowledgment frequency (LANACKFRQ) parameter for both the sending stations and receiving stations is essential for optimal performance. Other values may decrease throughput by 50% or even more if conditions tri
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v Mix interactive and batch jobs on a wide area network line v Performance considerations for AnyNet communications v Subsystems Considerations for subsystem configuration for error recovery performance Each piece of work that runs on the AS/400 system is called a job. Each job is a single, identifiable sequence of processing actions that represents a single use of the system. The basic types of jobs performed are interactive jobs, batch jobs, spooling jobs, autostart jobs, and prestart jobs. Jo
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Example: Communications subsystem configuration 1. Create a duplicate of QCMN: CRTDUPOBJ OBJ(QCMN) FROMLIB(QSYS) OBJTYPE(*SBSD) TOLIB(MYLIB) NEWOBJ(MYCMN) 2. Set up the communication entries: ADDCMNE SBSD(MYLIB/MYCMN) DEV(PC*) ADDCMNE SBSD(MYLIB/MYCMN) DEV(PC*) MODE(QSERVER) MAXACT(0) ADDCMNE SBSD(QSYS/QCMN) DEV(PC*) MODE(QPCSUPP) MAXACT(0) 3. If desired, update your system startup program to start your new subsystems automatically. Communications performance considerations for interactive jobs
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Example: Interactive subsystem configuration 1. Create a subsystem description: CRTSBSD SBSD(MYLIB/MYINTER) POOLS((1 *BASE) (2 *INTERACT)) 2. Create a class CRTCLS CLS(MYLIB/MYCLASS) RUNPTY(20) 3. add routing entries to your subsystem: ADDRTGE SBSD(MYLIB/MYINTER) SEQNBR(10) CMPVAL(QCMDI) PGM(QSYS/QCMD) POOLID(2) ADDRTGE SBSD(MYLIB/MYINTER) SEQNBR(9999) CMPVAL(*ANY) PGM(QSYS/QCMD) POOLID(2) 4. Create a job queue, and add the job queue entry to your new subsystem: CRTJOBQ JOBQ(MYLIB/MYJOBQ) ADDJOB
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v Change the request/response unit size to a lower value for the large transfer. This parameter setting optimizes response time at the expense of large transfer performance. v Reduce the pacing values for the large transfer to slow it down, which allows the interactive users more windows for getting on the line. Note: The overall central processing unit time increases for the large transfer. For more information about AS/400 communications, see the Communications Configuration book. Performance
