Hitachi HUS VM - System Architecture Overview; Hardware Architecture; HUS VM RAID Implementation

System architecture overview
This section briefly describes the architecture of the Hitachi Unified Storage
VM storage system.
Note: The HUS VM is an “open systems” only array. Mainframe systems are
not supported.
Hardware architecture
The basic system architecture is shown in the following diagram.
Figure 2-1 HUS VM Architecture Overview
The system consists of two main hardware assemblies:
• A controller chassis that contains the logic and processing components
• One or more drive trays that contains disk drives and/or solid state
(flash) drives. Drive trays are not included in diskless systems.
These assemblies are explained briefly in Chapter 1.
HUS VM RAID implementation
This section provides an overview of the implementation of RAID technology
used on the Hitachi Unified Storage VM storage system.
The objectives of the RAID technology are the low cost, high reliability, and
high I/O performance of disk storage devices. To achieve these objectives,
this storage system supports levels 1, 5 and 6 of RAID technologies (in this
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Hardware architecture
Hitachi Unified Storage VM Block Module Hardware User Guide