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The six parts of the book are all available. A received command via network for the shutdown of the AS iSeries will be executed pursuant its authorization and the customized conditions. At its heart everything tends to be a command and even the menus that you see use commands behind the scenes. All of these commands are known as control language. AS 4 Jan Start here for all ISeries manuals From IBM. IBM Content Manager for iSeries: Application Programming Guide and Reference [PDF], Electronic business and web serving, Manual. IBM Content Manager for iSeries: Getting Started with Client for Windows [PDF], Electronic business and web serving 10 Jul Gottfried Schimunek.
Todd Thomsen. Adobe Premiere Lower Thirds Download Movies. Randall West. Ken Wettlaufer. Learn the concepts and tasks associated with implementing J. Employ the best practices for OneWorld implementation. Make your system run faster, smoother with valuable tips and techniques Unfortunately you are limited to only downloading spool files as ASCII or text based formats.. Spool files Any printable output on an iSeries is referred to as a spool file. For printing or viewing on the screen spool files are nice. In general, having the appropriate line speed is the key consideration for gaining the best performance. v Check the difference in performance between half-duplex utilization and full-duplex utilization on the line description. 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 other line that runs the same type of work. Additional considerations for adjusting the wide area network line speed are the following:. v A common misconception about the line speed of each attached communications line is that central processing unit CPU resource is used in a uniform fashion. The amount of line resource that is used is proportional to the total number of bytes that are sent or received on the line. Some additional CPU resource is used to process the communications software to support the individual sends puts or writes and receives gets or reads.
v When a single job is running disk operations or doing non-overlapped CPU processing, the communications link is idle. If several sessions transfer concurrently, then the jobs are more interleaved and make better use of the communications link. v Polling is an important consideration for synchronous data link control SDLC environments. All SDLC polling is handled by the communications controller and is governed by parameters in both the line and controller descriptions. When configuring a communications controller, you should consider both subsystem storage and aggregate line speed. Subsystem storage is the amount of storage available on the communications controller. Aggregate line speed is the sum of individual lines speeds that are attached to the communications controller. Exceeding this threshold in a large transfer environment or with a small number of concurrent users may still offer acceptable performance.
It is important to distribute the work load across several IOPs if the performance capabilities of a single IOP is exceeded. v The use of larger frames generally improves large transfer performance in terms of capacity for the communications IOP and in terms of system response time. The amount of time that the IOP spends. 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 line. It is possible to see a relatively high IOP use at low throughput levels.
This efficiency allows advanced program-to-program communications APPC to send request units to the IOP, passing the processing cost of processing frame to the IOP. The following information can help you understand the protocol considerations for local area networks. v A Data Link Control DLC can achieve a significantly higher data rate than other supported line types. This is due to the desirable combination of having a high media speed along with large frame sizes. v When several sessions use a line or LAN concurrently, the aggregate data rate may be higher than when only one session is used. Operating at higher utilization may decrease response time because of excess queueing time for the line. In a large transfer environment in which a small number of users contend for the line, a higher line use may still offer acceptable performance. Several parameters in the line description LIND and the controller description CTLD play an important role in system performance that you can change.
The following information can help you to understand the line considerations for local area networks. v MAXFRAME on the line description LIND and the controller description CTLD : Maximizing the frame size in a LAN environment supplies the best performance for large transfers. A large frame size does not negatively affect performance for small transfers. Otherwise, of the two maximum frame size values, the smaller is used when you transfer data. Bridges may also limit the maximum frame size. You should change the default value from to a larger size. v LANMAXOUT on the CTLD for advanced program-to-program communications APPC environments : This parameter governs how often the sending system waits for an acknowledgment.
The LANACKFRQ. 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. v For large transfer environments, changing the LANMAXOUT value may significantly increase performance. As starting points, use the following guidelines:.
The following information can help you to understand the line speed considerations for IOPs. v The integrated PC server performance is similar to the and the IOPs for host LAN functions. For send and receive scenarios, performance is equivalent. For large transfers, the IOP is slightly faster than the TRLAN IOP, but slightly slower than the Ethernet IOP. These differences are not significant enough to choose one over the other. v The Mbps Ethernet support provides the best LAN performance. The IOP can be optimally configured to have an aggregate transfer rate of 27 Mbps. Multiple concurrent large transfers may be required to drive at that rate. v When analyzing communications performance that includes the TRLAN IOP, you should be aware that resources other than the IOP use can become the bottleneck. v You should have the highest capacity IOP available for file serving.
You should have the highest capacity IOP available for environments that use many communications input and output operations for each transaction. The highest capacity IOP also minimizes the overall response time. To assess the performance of your data path, you may want to review the following topics:. v Considerations for subsystem configuration for error recovery performance. v Communications performance considerations for interactive jobs. v Consider communications performance for batch jobs. v Mix interactive and batch jobs on a wide area network line. v Performance considerations for AnyNet communications. 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. As the number of users on the system increases, it becomes important for you to consider how the communications and interactive subsystems should be configured.
The configuration of subsystems has little impact in normal data path operations. However, multiple subsystems can provide multiple processes to do cleanup and recovery when error conditions occur. This can result in improved performance. As the number of users on the system increases, you must consider the importance of how subsystems are configured:. v Consider limiting the number of devices that are serviced by a single subsystem. Between and devices for each subsystem are recommended. Use the following recommendations to divide these users:. v Create additional communications and interactive subsystems to split the work into multiple subsystems.
v The work that is performed in the QCMN subsystem is for connecting and disconnecting from the system. Error recovery considerations are important in the configuration of the communications subsystem. v To prevent a subsystem from ever allocating a device, ensure that there are no workstation or type entries for the devices that you do what allocated by that subsystem. v For each subsystem you have defined, you need to identify which users will run in which subsystems. Use the Add Work Station Entry ADDWSE command and the Remove Work Station Entry RMVWSE command. You can set up work stations entries that identify which devices that subsystem should allocate, as well as which devices a subsystem should not allocate.
Note: You can use the ADDWSE commands while the subsystem is active. However, subsystems do not reallocate device locks dynamically. Eventually, it may be necessary to end and restart the subsystems to have the device locks allocated to the desired subsystem. To specify the devices a communications subsystem should allocate:. To specify the devices a communications subsystem should not allocate:. Note: Database and file servers run only in QSERVER. Do not attempt to allocate sessions running over the QSERVER mode description. You can do this by adding the following communication entry to your subsystem:. See the following example for a way of configuring your communications subsystem. Create a duplicate of QCMN:. Set up the communication entries:. If desired, update your system startup program to start your new subsystems automatically.
An interactive job is one that uses a keyboard and character-type display. If a job needs the user to type on the keyboard and display character results, that job is probably considered interactive. Interactive in this sense means that the job and the user depend on each other to get the work done. To optimize communications performance for interactive jobs, consider the following:. v Attach work stations through communications requires more CPU overhead than local workstations. v Use a twinaxial controller to provide better performance than an American National Standard Code for Information Interchange ASCII controller. v Keep the line utilization below 30 percent for best performance when interactive users are attached. This will maintain predictable and consistent response times. Exceeding 50 to 60 percent line utilization will usually cause unacceptable response times. If your system has interactive users who are connected many different ways, you should consider configuring your interactive subsystems to separate the users.
Local workstation, remote workstations, display station pass-through, or Telnet are some examples of these types of connections that should be separated. When you configure interactive subsystems, identify how you want the interactive users to be separated and create the appropriate subsystem descriptions. During error recovery, when many users risk losing their sessions at one time, an interactive subsystem can be very busy performing device recovery. This device recovery can adversely affect the work of other users in the subsystem who would otherwise be unaffected by the failure. Therefore, you may need to change how the interactive subsystems are configured. To specify the devices an interactive subsystem should allocate when the subsystem is started:. To specify the devices an interactive subsystem should not allocate when the subsystem is started:. v See the following example for a way of configuring your interactive subsystem.
Create a subsystem description:. add routing entries to your subsystem:. Create a job queue, and add the job queue entry to your new subsystem:. Set up the workstation name entries. The basic types of jobs that are performed are interactive jobs, batch jobs, spooling jobs, autostart jobs, and prestart jobs. Batch jobs are predefined groups of processing actions that are submitted to the system to be performed with little or no interaction between the user and the system. Batch jobs can be tuned for optimized performance. v Break the application into pieces and having multiple batch threads jobs operate concurrently. v Reduce the number of open and close operations, input and output operations. v If you have a considerable amount of main storage available, consider using the Set Object Access SETOBJACC command.
This command preloads the complete database file, database index, or program into the assigned main storage pool if sufficient storage is available. v Try to limit the number of communications input and output operations by doing fewer and perhaps larger application sends and receives when communications lines are used. v Block the data in the application. Try to place the application on the same system as the frequently accessed data. For more information about batch job performance, see the Communications Management book. When interactive users and large transfers are running on a communications line concurrently, you may need to change configuration parameters. To mix interactive and batch jobs on a wide area network WAN line, consider the following to keep interactive performance acceptable:.
This is the preferred method to transfer batch and interactive jobs. 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. AnyNet communications is a good performance factor for you to consider. v For send and receive pairs, the most efficient use of an interface is with its own protocol stack. That is, intersystem communications function ICF and common programming interface communications CPI Communications perform the best with advanced program-to-program communications APPC. There is additional CPU time when the crossover between the protocols processes.
v Each communications interface performs differently depending on the scenario. ICF and CPI Communications perform the best with APPC. Hence, performance implications can be surpassed by not using AnyNet. These products allow you to use application programs that are written for a certain communications protocol but also run over non-native communications protocols without changing or even re-compiling the application program. The choice of the destination address controls whether the request is sent over the native protocols or through the AnyNet code and on to a non-native protocol. Identify the set of IP addresses to route over the SNA network. Tell the system how to convert the IP address to the SNA format. For more information about IPX Support, see the Internetwork Packet Exchange IPX Support. AnyNet is a family of products that allow applications that. are written for one type of network protocol to run over a different type of network protocol.
For example, without AnyNet, your choice of application program interface API dictates your choice of network protocol, or your choice of network protocol dictates your choice of APIs. AnyNet allows you to mix and match applications with network protocols. In fact, you can do this without changing your application programs. Your destination address such as a remote location determines the type of network protocol to use. Programs supported include File Transfer Protocol FTP , Simple Mail Transfer Protocol SMTP , Simple Network Management Protocol SNMP , PING, and user-written sockets programs. The application program uses Location names to specify the source and destination address. Programs supported include distributed data management DDM , Distributed Relational Database Architecture DRDA , SNA distribution services SNADS , display station pass-through, Client Access, user-written CPI-Communications programs, and user-written ICF programs.
For more information about using both AnyNet and nonAnyNet sockets, see the Sockets Programming book. A subsystem is a single, predefined operating environment through which the system coordinates work flow and resource usage. The run-time characteristics of a subsystem are defined in an object that is called a subsystem description. IBM supplies several subsystem descriptions that can be used with or without modification:. A new subsystem can also be defined with the Create Subsystem Description CRTSBSD command. For more information about creating subsystems, see the Work Management book. Communications applications that are used in an APPC advanced program-to-program environment are also available to be used in an APPN and HPR environment; only the method by which data is transported is changed.
APPC delivers the data from applications higher in the SNA layers down to APPN for transportation through the network. User-written APPC applications and distributed data management DDM are fully supported in an APPN and HPR environment. The topic, Application programming interface API performance considerations gives a more complete discussion of APPC applications. When you encounter problems that indicate that the route to the remote location cannot be found, you can attempt to make the connection again with the Start Pass-Through STRPASTHR command.
See the topic, Solving remote communication problems using STRPASTHR for more information. APPN performs many functions in a communications environment. Therefore, it is important to consider time-out parameters in APPC programs which use ICF. In particular, it may be important to increase the WAITFILE parameter for these applications so that they do not time-out while waiting for APPN functions to be performed. APPN function is transparent to APPC programs using APPN take advantage of the following routing functions:. v Non-adjacent nodes appear adjacent and so APPC programs may communicate directly to programs in non-adjacent nodes without any APPC programs on the intermediate nodes. v Performance is improved for APPC programs with session endpoints that are not physically adjacent in the network. v APPC programs may communicate directly to programs in nodes in an adjacent APPN network through network nodes.
DDM is a function of the operating system that allows an application program or user on one system to use database files stored on remote systems. The systems must be connected by a communications network, and the remote systems must also be using DDM. v Access data files that reside on remote systems target systems. v An application can add, change, and delete data records in a file that exist on a target system. v Create, delete, or rename files on a remote system. v Copy a file from one system to another. When DDM is in use, neither the application program nor the program user needs to know if the file that is needed exists locally or on a remote system.
Remote and local file processing are essentially handled the same way. To optimize APPC performance, consider the following:. v Using larger sends for a given large transfer record sizes provides a higher application data rate and decreases CPU time. With the larger record size, the CPU has less processing to do because there are fewer application reads and writes to transfer the same amount of data. The frame size is on the line description that you choose. v Compression with APPC should be used with caution and only for slower speed wide area network WAN environments.
Many suggest that compression should be used with speeds v If you are doing tasks that include repetitive, small puts; better performance is achieved if you use ICF or CPI Communications. v Performance considerations for Intersystem Communications Function. v Performance considerations for Common Programming Interface communications. You can use intersystem communications function ICF to write application programs that you want to communicate with advanced program-to-program communications APPC. You must determine which system is to send data first before you write the program. ICF data management handles the communication functions and the data for your program. In particular, ICF should be used to do tasks that include repetitive, small inputs. v Eliminate unused record formats. v Use separate record formats instead of multipurpose record formats with option indicators.
v Code to use the same record format for repeated operations. v Set the maximum program devices equal to 1. v Use a separate indicator area. v The use of the ICF keywords force data and confirm should be minimized. v Use the Request to Send keyword only when necessary. v Use the Invite Only keyword when soliciting input from multiple devices, otherwise use the Read keyword instead. v If using the Invite keyword to solicit from multiple program devices, follow it with a Read-from-invited operation, not a Read operation. To create device descriptions to get your system set up for ICF, do the following:. Use the online help information to choose the parameter values.
The device description is created. v ICF Programming. You can use Common Programming Interface Communications CPI Communications to write application programs that you want to communicate with advanced program-to-communications APPC. The interface makes use of the System Network Architecture SNA LU logical unit 6. v Exchange control information. v Notify a partner program of errors. Intersystem communications feature ICF and CPI Communications programs have similar performances for small data transfers. v Minimize the use of flush and confirm. v Receive a compile record and parse it in your buffer.
v Do not use multiple receive calls to receive a single record. v Use Request-to-Send only when necessary. To add or change communications entries to get the system set up for CPI Communications, do the following:. v Add Communications Entry ADDCMNE.
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v Attach work stations through communications requires more CPU overhead than local workstations. January Big Data The definitive guide to the revolution in business analytics shaping tomorrow with you. Improving local area network performance. parameter value on one system should never have a greater value than the LANMAXOUT parameter value on the other system. In this video, I provide a simple explanation and overview and also discuss the implications for artificial intelligence, self-driving vehicles, and more!
A subsystem is a single, predefined operating environment through which the system coordinates work flow and resource usage. v Increase frame relay to capacity. Imagine the World Wide Web as a network of stops in a big city subway system. v Create Line Description Distributed Data Interface DDI CRTLINDDI. File Download Dialog Box. Kenexa provides personality and behavioral tests to help recruiters determine if a candidate's.
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