Chapter 2 Subsystem Architecture And Components; Overview; Figure 2.1 Lightning 9900™ Histar Network (Hsn) Architecture - Hitachi 9900 User And Reference Manual

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.
Data Cache
Cache Switch
Figure 2.1 Lightning 9900™ HiStar Network (HSN) Architecture
DTA
control cache
Data Cache
Cache/Data Side Cache/Data Side
Cache Switch
Processor Side Processor Side
DTA
CHT CHT
MPA MPA DTA
Data Cache
Cache/Data Side
Cache Switch
Processor Side
MPA MPA DTA
ACP ACP
Hitachi Lightning 9900™ User and Reference Guide
control cache
Data Cache
Cache/Data Side
Cache Switch
Processor Side
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