Shared-cache clusters in a system with a fully shared memory
IBM Journal of Research and Development - Special issue: IBM S/390 G3 and G4
IBM Journal of Research and Development
IBM S/390 storage hierarchy: G5 and G6 performance considerations
IBM Journal of Research and Development
Flexible configuration and concurrent upgrade for the IBM eServer z900
IBM Journal of Research and Development
First- and second-level packaging of the z990 processor cage
IBM Journal of Research and Development
Accelerating system integration by enhancing hardware, firmware, and co-simulation
IBM Journal of Research and Development
Design methods for attaining IBM System z9 processor cycle-time goals
IBM Journal of Research and Development
IBM system z10 processor cache subsystem microarchitecture
IBM Journal of Research and Development
Functional verification of the IBM system z10 processor chipset
IBM Journal of Research and Development
Scalable and modular pervasive logic/firmware design
IBM Journal of Research and Development
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Integral to the significant capacity growth of the IBM eServerTM z990 (the eighth-generation zSeries® CMOS-based server) from its predecessor z900 system is the interconnect architecture, which tightly couples 48 customer CPUs in the system. A major attribute of this architecture is a new "hot swap" feature which improves zSeries system availability for customers by permitting the substitution or addition of a field-replaceable unit (FRU) in the processor subsystem without requiring the system to be powered down. The novel two-level interconnect architecture contains a distributed switch which connects up to four processor-memory nodes in book packages. The book packages, which are also FRUs, are connected in a dual concentric ring topology at the second-level (L2) interconnect. This architecture also contains an integrated 32-MB L2 cache and central switch connecting up to eight dual-core processor chips in a star topology at the first-level interconnect inside one of these nodes. This paper describes the bus protocol on the second-level interconnect, the cache coherency management throughout the storage hierarchy, and the ring topology reconfiguration for hot swap. Also described is a memory, power management scheme to support the power demand from the 48 CPUs and up to 256 GB of memory.