6947ch06.fm Draft Document for Review April 7, 2004 6:15 pm
138 IBM eServer zSeries 990 Technical Guide
򐂰24 processors (sum of CPs and zAAPs) within a single logical partition.
򐂰zSeries Application Assist Processors (zAAPs).
Dynamic addition and deletion of a logical partition name
z/OS V1.6 supports dynamic naming of a reserved logical partition. Reserved logical
partitions are defined with a name placeholder ‘ * ’ and can be dynamically named or
removed from the list of named logical partitions.
A dynamic partition must be reserved in the IOCDS and will be established when a Power-On
Reset with this IOCDS is executed. A reserved partition has a MIF ID and usage type
assigned.
24 processors within a single logical partition
z/OS V1.6 supports up to 24 processors (the sum of CPs and zAAPs). Note that the sum of
initial and reserved processors, including CPs and zAAPs, for an ESA/390 mode logical
partition can go up to 32 processors.
zSeries Application Assist Processor (zAAP)
Support for the zSeries Application Assist Processor is introduced in z/OS V1.6. This z/OS
release is planned to be available in September 2004.
A zAAP reduces the standard processor (CP) capacity requirements for Java applications
freeing up capacity for other workload requirements. zAAPs do not increase the MSU value of
the processor and therefore do not affect the software license fee.
zAAPs only run Java code. The IBM SDK for z/OS, Java 2 Technology Edition (the Java
Virtual Machine) in cooperation with z/OS, and PR/SM directs JVM processing from CPs to
zAAPs. Apart from the cost savings this may realize, the integration of Java based
applications with their associated data base systems such as DB2, IMS, or CICS may simplify
the infrastructure, e.g. reducing the number of TCP/IP programming stacks, and server
interconnect links. Furthermore, processing latencies, that would occur if Java application
servers and their data base servers were deployed on separate server platforms, are
prevented.
Note: zAAPs are not supported for a z/OS guest under z/VM.