Hitachi Universal Storage Platform V - Multiple Data and Control Paths

Architecture and Components 2-3
Hitachi Universal Storage Platform V/VM User and Reference Guide
DKA DKA
CSW CSW
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4 Gb
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Max. 60
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Disk Unit
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Max. 240 data drives per storag e system
Drive Path (max. 8 path s)
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Power Supply
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Figure 2-2 Universal Storage Platform VM Hardware Architecture
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.