Hitachi Unified Storage VM Product Overview Guide
1–4
System overview
and 5-1/4 inch flash module drives. The total storage space of this
configuration is 3,383 TB. The Hitachi Unified Storage VM Block Module
Hardware User Guide contains details about the data drives.
In addition to a varying number of data drives, the system can be
configured with disk drives of different capacities and speeds, varying
numbers of host I/O modules and back-end I/O modules, and varying cache
capacities, as follows:
• Two to four host I/O modules (each is a pair of boards). This provides a
total of 8 when all of the host I/O module slots are used and there are
no back-end I/O modules installed, as in a diskless system. The
maximum total number of host I/O modules and back-end I/O modules
is 8.
• Two to four back-end I/O modules (each is a pair of boards). This
provides a total of 8 when all of the back-end I/O module slots are used.
In this case only two host I/O modules can be installed.
• Cache memory capacity: multiple configurations from 32 GB to 256 GB
• Disk drive capacities of 300 GB, 600 GB, 900 GB, and 3TB
• Flash drive capacities of 200 GB, 400 GB and 800 GB
• Maximum available channel ports: 40 with disks, 48 if diskless
High performance
The HUS VM block module storage system includes several features that
provide very high system performance. These include:
• High speed disk drives that run at 7,200, 10,000, or 15,000 RPM
• SSD flash drives with ultra high speed response
• Flash module drives with ultra high speed response
• High speed data transfer between the back-end I/O module and HDDs
at a rate of 6 GBps with the SAS interface
Figure 1-1 Example HUS VM storage system configurations
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