Hitachi 9900 Series - Manual (Page 24)

15
Hi-Star Architecture – An
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.
4
Figure 12 – The Cache
Hierarchical Star
Network (C-HSN)
provides fully redundant
switched access to cache
from all channel
adapters.