ssrs barcode The Spool Work Process in Software

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The Spool Work Process
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Every printer or other type of output device defined in the spool system requires an associated spool work process, which will take care of handling all spool requests for the specific devices. It's also possible to have the same printer defined (with different names) for being managed by different spool work processes. This is sometimes done for contingency situations when an application server might be stopped. As introduced both in Chap. 2 and in the previous section, the spool work process is one of several types of SAP work processes running on an application server that formats the data in a spool request and then sends it to the host spool system. Actually, the spool request contains a reference to the data, the specific output device (printer), and the printing format. The data itself is kept in the TemSe database. 473
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Spool Servers, Hierarchies, and Load Balancing When the spool system sends the request for actual printing, it then generates an output request (or print request), which is handled by the spool work process. To generate the output request, the spool work process converts the spool request into a device specific (printer specific) output stream. Performing this conversion requires: Translating (resolving) SAP device print controls into actual printer commands, adding initialization strings corresponding to specific device types If needed, converting the character set used within the SAP system to the character set understood by the output device Formatting the data for generating the output request using the printer driver assigned to the device type for SAPscript output The spool work process will finally send the data to the host spool system, and, in the case of PC printing, to the SAPLPD program, which communicates directly with the Windows print manager. The SAP profile parameter that controls the number of spool work processes per instance is rdisp / wp_no_spo, which can be maintained from the CCMS instance profile maintenance utility. Since release 4.0, you can define more than one spool work process per server even if there is only one instance installed in the application server. One big advantage of enabling the definition of more than one spool work process is the possibility of sending parallel output requests from the same R/3 instance. Before release 4.0, only one spool work process was allowed per instance; and considering that work processes were not multithreaded, the output requests were sequentially processed, so a request was not handled until the previous one was finished. Having several spool work processes per instance avoids bottlenecks caused by such things as communication problems between spool work processes and printing devices (PCs, network printers, LAN connections, and others) that could be temporarily turned off or unavailable. With multiple spool work processes, these other requests can be handled by additional free spool work processes. Before R/3 release 4.0, the spool server assignment and spool server work process were static, so that each device was assigned to a specific server that only had one spool work process. Since release 4.0, it is possible to implement spool load balancing by using spool server groups. This is known as dynamic spool assignment.
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Spool Servers, Hierarchies, and Load Balancing
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As discussed in the previous section, dynamic spool server assignment was introduced with release 4.0, allowing for printing load balancing. Spool servers provide greater flexibility in defining and configuring printing systems in R/3 installations. Spool servers can be configured on the basis of different attributes, and there is also the possibility of defining different types of spool servers. There are two types of spool servers: Real or physical Logical A logical server is mapped directly or indirectly to a real spool server. Logical servers are given a name pointing to another logical server or to a real server. Relationships between spool servers, whether logical or real, define different hierarchies. 474
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Server Selection A hierarchy is a dependency relationship of different levels that define priorities when spool requests are being managed by the spool servers within the hierarchy. A hierarchy is established when a spool server, whether logical or real, is assigned an alternative spool server. Hierarchies can be as complex as required. There is a relationship between a spool server and its alternate spool server. If the server is logical, then there is an additional relationship between the logical server and the server it is pointing to, which can also be either physical or logical. Output requests assigned to logical servers are processed by the real server. For example, a SAP R/3 system made of two application servers, ntsap_NT1_00 and ntsap_NT2_00, has two logical spool servers Logical_NT1 and Logical_NT2. These logical servers are defined as Nonexclusive spool servers, have Production print (type P) as their server class, and are mapped to real spool servers ntsap_NT1_00 and ntsap_NT2_00, respectively. Additionally, logical server Logical_NT1 has Logical_NT2 as an alternate server. Figure 14 2 shows the hierarchy relationship.
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Figure 14 2: Spool server relationships. The horizontal relationship represents the mapping between a logical server and another server (either logical or real). The vertical relationship links the logical server with an alternate server (either logical or real). The definition and configuration of logical spool servers can be performed and tested on development system, then transported to production systems at a later time with minimal and quick adjustments. When logical servers are defined as Nonexclusive spool servers, they are enabled for the process of load balancing, which means that the system will take into consideration both the logical server and the alternate server when calculating and finding the most appropriate server for processing output requests.
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