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ETERNUS DX80 S2/DX90 S2 Disk storage system User’s Guide -Site Planning-
Copyright 2013 FUJITSU LIMITED P3AM-4822-12ENZ0
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Chapter 1
Hardware Configurations
This chapter explains hardware configurations for the ETERNUS DX Disk storage system.
1.1 Controller Enclosure
This section explains the main components in the controller enclosure.
The controller enclosure contains drives installed in the front, and controllers and power supply units in the
rear.
Since the power supply units are redundant, operations can continue even if one of them fails. There are two
models: a single-controller type and a dual-controller type. For a dual-controller type, operations can continue
even if one of the controllers fails.
■ External views of a 2.5" type controller enclosure
●
Front view
Figure 1.1 Front view of a 2.5" type controller enclosure
• The single-controller type differs from the dual-controller type by the following features:
- The controller and I/O module are not duplicated.
- Hot maintenance or swapping of the controller and I/O module is not possible.
- Concurrent firmware loading or update of the controller firmware and I/O module firmware is not
possible.
- Multipath connection to a single server is not available.
- The Thin Provisioning function cannot be used.
- The Flexible Tier function cannot be used.
• Fujitsu recommends that the dual-controller types, in which the controller and I/O module are duplicated,
be used in a system where a high level of reliability is required.
2.5" disk or 2.5" Solid State Drive (SSD)