Hitachi 3080 G2, Hardware Reference Manual

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System components
The system contains many components and is housed in a rack or cabinet.
This section describes the main system components.
Component Description
Hitachi NAS
Platform or
Hitachi Unified
Storage File
Module server
The system can contain a single server or several servers that operate as a
cluster. Clusters that use more than two servers include two 10 Gbps Ethernet
switches. Hitachi Data Systems supports two switches for redundancy.
For information about the physical configuration of a cluster configuration, see
the
Hitachi Unified Storage File Module and Hitachi NAS Platform System
Installation Guide .
Note:
For additional data protection, it is recommended to use an
external UPS to power the server. Also, each of the redundant power
supplies in the server and in the storage subsystems should be
operated from a different mains power circuit in order to provide a
degree of protection from mains power supply failures. In the event
that one circuit fails, the other will continue to power the server and
the storage subsystem.
System
management unit
(SMU)
A standalone server can operate without an external SMU, but all of the cluster
configurations require an external SMU.
The SMU is the management component for the other components in a system.
An SMU provides administration and monitoring tools. It supports data
migration and replication, and acts as a quorum device in a cluster
configuration. Although integral to the system, the SMU does not move data
between the network client and the servers.
In a single-server configuration, typically an embedded SMU manages the
system. In clustered systems and some single-node systems, an external SMU
provides the management functionality. In some cases, multiple SMUs are
advisable.
Storage
subsystems A Hitachi NAS Platform or Hitachi Unified Storage File Module system can
control several storage enclosures. The maximum number of storage enclosures
in a rack depends on the model of storage enclosures being installed. Refer to
the
Storage Subsystem Administration Guide for more information on
supported storage subsystems.
Fibre Channel
(FC) switches
The server supports FC switches that connect multiple servers and storage
subsystems.
Contact Hitachi Data Systems Support Center for information about which FC
switches are supported.
External Fast
Ethernet
(10/100) or
Gigabit Ethernet
(GigE) switches
A standalone server can operate without an external Ethernet switch, provided
that it uses an embedded SMU and there are less than three RAID subsystems
attached.
A standalone server requires an external Ethernet switch if there are more than
two RAID subsystems attached or if there are two RAID subsystems attached
and an external SMU is used.
System overview 31
Hitachi NAS Platform 3080/3090 G2 Hardware Reference Guide