Sun Fire E25K
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The Sun Fire 25K is an enterprise-class server computer from Sun Microsystems. Announced in February 2004, the machine is most modestly put as an upgraded Sun Fire 15K as the base cabinets are identical with the only difference between them being the Processor books installed.
The Sun Fire 25K supports up to 72 dual-core UltraSPARC IV+s (up to 1.8 GHz) installed across 18 system boards. Where in the 15K there is the possibility to use slots of an additional crossbar to plug in extra 2-CPU boards to extend the computational power at the cost of I/O capacity, this possibility is not offered for the E25K system. For overall system bandwidth, Up to 172.8-GB/sec aggregate, up to 115.2-GB/sec peak, and up to 43.2-GB/sec sustained. For Overall I/O bandwidth, Up to 35.8-GB/sec sustained. Up to 64 GB of RAM per board with maximum of 1.15TB of RAM for a single domain. Up to 72 hot swappable PCI-X I/O slots, 54 slots are 90MHz, 18 slots are 33MHz; supports 10/100 BaseT Ethernet, Gigabit Ethernet, UltraSCSI (LVD and HVD), ATM, FC-AL, HSI and SCI.
The system can be divided into a maximum of 18 secure independent domains (one domain per system board), each of which is a separate machine with its own filesystems, root password and can run different versions of Solaris. Administrators can dynamically change the assignment of RAM and processors to the different domains to meet changes in business needs. In addition, the 25K contains two system controllers (duplicated for redundancy), which are Solaris systems used to manage the 25K and perform tasks such as booting and shutting down domains and assigning CPUs and RAM to domains. The 25K contains minimal storage in itself (only system controller boot disks); it is connected to a separate enterprise storage system.
