Compaq 9900 - Manual (Page 25)

Hitachi Lightning 9900™ User and Reference Guide 11
Chapter 2 Subsystem Architecture and Components
2.1 Overview
Figure 2.1 shows the Hierarchical Star Network (HiStar or HSN) architecture of the Lightning
9900™ RAID subsystem. The “front end” of the 9900 subsystem includes the hardware and
software that transfers the host data to and from cache memory, and the “back end”
includes the hardware and software that transfers data between cache memory and the disk
drives.
CHT
DTA MPA
CHT
DTA MPA
Data Cache
control cache
Data Cache
control cache
Data Cache Data Cache
Cache Switch
Processor Side
Cache/Data Side
Cache Switch
Processor Side
Cache/Data Side
Cache Switch
Processor Side
Cache/Data Side
Cache Switch
Processor Side
Cache/Data Side
ACP
DTA MPA
ACP
DTA MPA
Figure 2.1 Lightning 9900™ HiStar Network (HSN) Architecture