Intel 170 Servers, AS/400 RISC Server Domino-Complementary Processing, V5R1 Non-Domino Processing

Domino-Complementary Processing

Prior to V5R1, processing that did not spend the majority of its time in Domino code was considered non-Domino processing and was limited to approximately 10-15% of the system capacity. With V5R1, many applications that would previously have been treated as non-Domino may now be considered as Domino-complementary when they are used in conjunction with Domino. Domino-complementary processing is treated the same as Domino processing, provided it also meets the criteria that the DB2 processing is less than 15% CPU utilization as described below. This behavioral change has been made to support the evolving complexity of Domino applications which frequently require integration with function such as Java Servlets and WebSphere Application Server. The DSD models will continue to have a zero interactive CPW rating which allows sufficient capacity for systems management processing. Please see the section below on Interactive Processing.

In other words, non-Domino workloads are considered complementary when used simultaneously with Domino, provided they meet the DB2 processing criteria. With V5R1, the amount of DB2 processing on a DSD must be less than 15% CPU. The DB2 utilization is tracked on a system-wide basis and all applications on the DSD cumulatively should not exceed 15% CPU utilization. Should the 15% DB2 processing level be reached, the jobs and/or threads that are currently accessing DB2 resources may experience increased response times. Other processing will not be impacted.

Several techniques can used to determine and monitor the amount of DB2 processing on DSD (and non-DSD) iSeries servers for V4R5 and V5R1.

yWork with System Status (WRKSYSSTS) command, via the % DB capability statistic

yWork with System Activity (WRKSYSACT) command which is part of the IBM Performance Tools for iSeries, via the Overall DB CPU util statistic

yManagement Central - by starting a monitor to collect the CPU Utilization (Database Capability) metric

yWorkload section in the System Report which can be generated using the IBM Performance Tools for iSeries, via the Total CPU Utilization (Database Capability) statistic

V5R1 Non-Domino Processing

Since all non-interactive processing is considered Domino-complementary when used simultaneously with Domino, provided it meets the DB2 criteria, non-Domino processing with V5R1 refers to the processing that is present on the system when there is no Domino processing present. (Interactive processing is a special case and is described in a separate section below). When there is no Domino processing present, all processing, including DB2 access, should be less than 10-15% of the system capacity. When the non-Domino processing capacity is reached, users may experience increased response times. In addition, CFINT processing may be present as the system attempts to manage the non-Domino processing to the available capacity. The announced “Processor CPW” for the DSD models refers to the amount of non-Domino processing that is supported .

Non-Domino processing on the 270 and 820 DSD models can be tracked using the Management Central function of Operations Navigator. Starting with V4R5, Management Central provides a special metric called “secondary utilization” which shows the amount of non-Domino processing. Even when Domino processing is present, the secondary utilization metric will include the Domino-complementary processing. And , as discussed above, the Domino-complementary processing running in conjunction with Domino will not be limited unless it exceeds the DB2 criteria.

Interactive Processing

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 2 - Server Performance Behavior	36