Global InformationZIIP information
In IBM System z9 and successor mainframes, the System z Integrated Information Processor (zIIP) is a special purpose processor. It was initially introduced to relieve the general mainframe central processors (CPs) of specific Db2 processing loads, but currently is used to offload other z/OS workloads as described below. The idea originated with previous special purpose processors, the zAAP, which offloads Java processing, and the IFL, which runs Linux and z/VM but not other IBM operating systems such as z/OS, DOS/VSE and TPF. A System z PU (processor unit) is "characterized" as one of these processor types, or as a CP (Central Processor), or SAP (System Assist Processor). These processors do not contain microcode or hardware features that accelerate their designated workloads. Instead, by relieving the general CP of particular workloads, they often lead to a higher workload throughput at reduced license fees.
DB2 for z/OS V8 was the first application to exploit the zIIP, but now there are several IBM and non-IBM products and technologies that exploit zIIP. The zIIP requires a System z9 or newer mainframe. The z/OS 1.8 and DB2 9 for z/OS support zIIPs. IBM also offers PTFs for z/OS 1.6, z/OS 1.7, and DB2 V8 to enable zIIP usage. (DB2 9 for z/OS is the first release of DB2 that has support built in.)
IBM publicly disclosed information about zIIP technology on January 24, 2006. The zIIP hardware (i.e. microcode, as the processors hardware does not currently differ from general purpose CPUs) became generally available in May, 2006. The z/OS and DB2 PTFs to take advantage of the zIIP hardware became generally available in late June, 2006.
zIIPs add lower cost capacity for four types of DB2 work:
- Remote DRDA access via TCP/IP. This category includes JDBC and ODBC access to DB2, including access across LPARs via HiperSockets, such as Linux on IBM Z. The exception is access to DB2 V8 stored procedures, which redirect a small portion of the work. DB2 9 native remote SQL procedures do use the zIIP.
- Parallel query operations. DB2 9 can increase the amount of parallel processing and thus use the zIIP more.
- XML parsing in DB2 can use zIIP processors or zAAP processors.
- Certain DB2 utilities processing.