Hitachi 9960, 9900 Series Hi-StarArchitecture – An, Internal Switched, Hierarchical Star Network

Hi-Star Architecture – An	4
Internal Switched

Hierarchical Star Network

The Internal Hi-Star Architecture

The internal Hi-Star architecture consists of two separate networks, the Cache Hierarchical Star Network (C-HSN) and the Control Memory Hierarchical Star Network (CM-HSN).

The Cache Hierarchical Star Network

The C-HSN is the network used for transferring data to and from the main global data cache. The C-HSN can also be broken down into two component networks: the processor paths to the C-HSN and the actual C-HSN (as shown previously in Figure 2). Figure 12 provides a detailed illustration of the processor paths and the C-HSN.

Figure 12 – The Cache Hierarchical Star Network (C-HSN) provides fully redundant switched access to cache from all channel adapters.

15