Controllers; Figure 4.6 Rear View Of A 3.5" Type Controller Enclosure (With Two Controllers Installed) - Fujitsu ETERNUS DX60 S3 Overview Manual

Chapter 4 Hardware Configurations
4.1 Controller Enclosure
When two controllers are installed
•

Figure 4.6 Rear View of a 3.5" Type Controller Enclosure (with Two Controllers Installed)

1
3
1. Controller (CM#0)
2. Controller (CM#1)
3. PWC port
4. Drive interface (OUT) port
5. LAN (RMT) port
6. LAN (MNT) port
7. Host interface (CA#0)
8. Power supply unit (PSU#0)
9. Power supply unit (PSU#1)
4.1.1

Controllers

The controller contains a CPU, cache memory, System Capacitor Unit (SCU), Bootup and Utility Device (BUD),
host interfaces, and drive interface ports. The controller controls all operations in the ETERNUS DX.
An ETERNUS DX has one or two controllers.
When an ETERNUS DX has one controller, another controller can be added during system operation. If one of
the controllers fails in an ETERNUS DX with two controllers, the failed controller can be replaced while the
system is running.
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 pos-
-
sible.
Multipath connection to a single server is not available.
-
The Thin Provisioning function cannot be used.
-
Fujitsu recommends that the dual-controller types, in which the controller and I/O module are duplica-
•
ted, be used in a system where a high level of reliability is required.
4 5 6
7
8
52
FUJITSU Storage ETERNUS DX60 S3 Disk storage system Overview
Copyright 2014 FUJITSU LIMITED
2
3 4 5 6
7
9
P3AM-8972-01ENZ0