Multiple Data And Control Paths - Hitachi Universal Storage Platform V Reference Manual

Power Supply
Input
Power
AC-DC
AC-DC
PDB-Box Power
PDU
Power Supply
Supply
Input Power Supply
Power
AC-DC
Power
PDB-Box AC-DC
PDU
Supply
Power
Supply
Figure 2-2

Multiple Data and Control Paths

The Universal Storage Platform V/VM employs the proven Hi-Star™ crossbar
switch architecture, which uses multiple point-to-point data and command
paths to provide redundancy and improve performance. Each data and
command path is independent. The individual paths between the front-end or
back-end directors and cache are steered by high-speed cache switch cards
(CSWs). The USP V/VM does not have any common buses, thus eliminating
the performance degradation and contention that can occur in bus
architecture. All data stored on the USP V/VM is moved into and out of cache
over the redundant high-speed paths.
Hitachi Universal Storage Platform V/VM User and Reference Guide
Controller
SM Path
DKA
Battery
Battery
Box
Box
Cache Path
Disk Unit
Universal Storage Platform VM Hardware Architecture
Architecture and Components
Channel Interface
SMA
CHA
CHA
CHA
CSW
CMA
Drive Path (max. 8 paths)
Max. 60
data drives
Max. 240 data drives per storage system
SMA
CHA
CHA
DKA
CHA
CSW
CMA
FC-AL (4 Gbps/port)
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