ssrs barcode generator free Step 1: Sizing the System in Software

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Step 1: Sizing the System
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Sizing may have an impact on the overall installation process. But, if you just want to perform a simple installation test, you can skip this section as long as you have a system with minimum hardware requirements. Sizing is a complex and inaccurate procedure that involves a few different persons and organizations. A SAP customer usually requires the help of the chosen hardware vendor and of SAP itself. At the same time, these providers pass on to the customers lengthy questionnaires, with data that is fed into a sizing application to calculate the estimated size of the system. The goal of the sizing process is to define three very important figures: how much CPU power is needed (type and number of processors, memory, number of servers), how big the database will be (disk space necessary), and what the minimum recommended network infrastructure to support the SAP R/3 traffic is. The quality of the sizing is just as good as the quality of the data supplied by the customer. Sizing SAP systems is based on a unit known as the SAP Application Benchmark Performance Standard (SAPS). 100 SAPSs are equivalent to 2000 order line items processed in an hour (SD module) or 6000 dialog steps with 2000 postings in an hour (FI module). Usually the CPU and memory requirements are calculated considering the estimated user population per application module and an approach of transaction volumes at peak times. Every SAP application module can have a different processor power consumption depending on the depth of the transactions, and therefore they are assigned a load factor. Be aware that every SAP release or even the hardware partners could use different factors depending on their technology. Additional information such as requested average CPU and memory utilization and scalability of the platforms further defines the needed hardware. Database sizing requires more in depth business knowledge to be able to fill out the lengthy questionnaires supplied by SAP. Often customers are unable to supply this data accurately. In these cases, the approach usually is to supply a moderate amount of disk space based on similar configurations and later monitor the system growth and add more disk space when needed. This, however, might have some drawbacks including file system redesigns or time consuming database reorganizations. SAP has and supplies its partners with a sizing tool to help calculate the amount of disk space needed based on a business questionnaire. This sizing tool also helps to calculate the estimated tablespace sizes and the biggest tables it will include. This information is particularly useful when customer installations are defined as having a very large database 63
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Step 1: Sizing the System (VLDB). In the R/3 environment a VLDB can be considered a database larger than 30 GB. This is, however, a subjective approach that can be varied as new R/3 or database releases appear. The section entitled "Considerations for VLDBs" later in this chapter includes some important notes on preparing an installation for a VLDB. An easy and first approach to sizing can be the QuickSizer tool provided by SAP through SAPnet (sapnet.sap ag.de/quicksizer). With the quick sizing service, SAP customers can make an initial and categorized calculation of CPU, memory, and disk resources, based either on users by application module or on a transaction load profile. The results in terms of SAPSs and average disk volume requirements are immediately available, and customers can decide to pass on this information to the hardware partner directly from the QuickSizer form. This self service tool can be used in the initial project phase to gain an approximate idea for planning the systems infrastructure. As the project progresses, and more usage data is available, a double check should be done, either by using the Quicksizer tool again or by directing the information to the selected hardware partner. A third and sometimes underestimated factor for a correct sizing is the expected network traffic. Usually there are two types of network connections which require appropriate bandwidths: from the application servers to the database server (server network) and from the presentation servers (usually PCs) to the application servers (access network). The rule of thumb establishes an approximate figure of 1.5 to 2.5 Kbits/sec between presentation servers to application servers. This figure does not take into consideration other network traffic, both R/3 related (printing, downloading, graphics) and non R/3 related (mail, internet, other client/server applications). The load between application server and database server (when on different servers) depends on the overall system load, but a minimum of 10 Mbits/sec should be guaranteed. To calculate the network bandwidth, customers have to know the number of sites and the number of users per site and per module. SAP hardware and technology partners can help in this process. A formula based on benchmark is available for an approximate sizing:
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Where C = required line capacity measured in bits/sec N = number of users L = line utilization (0 < L < 1). Values of line utilization higher than 50% are not recommended. Tthinktime = think time between two dialog steps (average = 30 sec) Tresponse = response time (average = 1 sec) The R/3 installation kit, as well as the online help, include Integration of R/3 Servers in TCP/IP Networks, a valuable manual about the network configuration, which should be carefully read by installers or those responsible for network management. The sizing of an overall SAP installation has a direct impact on the following elements of the process: The installation type (a factor of how many servers and their intended tasks) The hardware and network configuration 64
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Step 2: Deciding On the Installation Type The layout and size of the file system The installation of the database The load of a customer database The printing infrastructure and strategy The postinstallation steps The description of this first step is solely intended to make you aware of all the implications of a correct system sizing.
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