Snow/Frost Configuration

The CCS computer for this phase of the acquisition consists of two seperate POWER4 Clusters (SPs) called Snow and Frost.  Each cluster contains 22 Regatta Servers.  The servers are tied together with two colony switch planes.  The first two Regatta servers on each system are reserved for interactive use, GPFS Servers and LoadLeveler Class 1 batch processing.  The remaining servers are compute servers.  Each Regatta server is divided into 8 logical partitions (LPARs).  Each systems therefore has 640 CPUs for compute and 64 CPUs for interactive, GPFS and Class1 batch use.  Each system has 14 TBytes of its own GPFS disk.  NFS is served up by two HACMP servers outside of each cluster.

Off the Shelf Regatta Server Characteristics

• 32-way SMP System
• 1300 MHz POWER4 CPUs
• 8-256 GBytes of Memory
• Can be subdivided into 16 smaller SMP images (LPAR)
• 1-16 switch connections per server
• One switch connection per SMP image (LPAR)

• Own operating system image
• Cache coherent SMP
• Own memory, not shared with other LPARs
• Own I/O capabilities
• Own switch connection

 

Combinations of Different Sized LPARs Permitted
# of Partitions	CPUs per Partition
1	32
2	16
4	8
8	4
16	2

• 4 POWER4 CPUs per LPAR (Node)
• 3 GBytes of usable real memory per LPAR
• 2 Colony switch connections per LPAR
• 2 Times the "large message" performance of the Winter Hawk2 Nodes (asp/bsp)
• Approximately the same "small message" performance of the Winter Hawk2 Nodes (asp/bsp)