Hitachi 9900 manual Internal Hi-StarArchitecture, Cache 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 16 provides a detailed illustration of the processor paths and the C-HSN of a Hitachi Freedom Storage™ Lightning 9900™ V Series Lightning 9970V™ system.

Figure 16 – The C-HSN of a Lightning 9970V system provides fully redundant switched access to cache from all channel adapters.

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