Storage Subsystem Components; Enhanced Disk Drive Modules (E-Ddms) - IBM System Storage DS5020 Installation, User's, And Maintenance Manual

v During any maintenance or attended power-up procedure, carefully follow the
v The storage subsystem supports simultaneous power-up to the system
v A storage system in an optimal state recovers automatically from an unexpected

Storage subsystem components

The storage subsystem has the following removable components. These
components, called customer replaceable units (CRUs), are accessible from the
front or back of the storage subsystem.
v Up to sixteen 4 Gbps Fibre Channel or SATA Enhanced Disk Drive Modules
v Two RAID controllers
v Two ac power supply and fan units
v Two battery units
v SFP modules
The hot-swap features enable you to remove and replace 4 Gbps Fibre Channel or
SATA E-DDMs, power supply and fan units, and controllers without turning off the
storage subsystem. You can maintain the availability of your system while a
hot-swap device is removed, installed, or replaced.

Enhanced Disk Drive Modules (E-DDMs)

The hot-swap drive bays that are accessible from the front of your storage
subsystem are shown in Figure 1.
Figure 1. DS5020 hot-swap drive bays
For more information about how to complete these tasks, check the DS Storage
Manager online help or the Storage Manager guide for your operating system.
power-up sequence listed in "Powering on the storage subsystem" on page 97.
Check that each component of the subsystem is powered-on in the proper order
during this entire power-up procedure so the controller will be able to optimally
access all of your storage subsystems.
components, but always follow the power-up sequence listed in "Powering on the
storage subsystem" on page 97 during any attended power-up procedure.
shutdown and unattended simultaneous restoration of power to system
components. After power is restored, call IBM support if any of the following
conditions occur:
– The storage subsystem logical drives and subsystems are not displayed in the
DS Storage Manager graphical user interface (GUI).
– The storage subsystem logical drives and subsystems do not come online.
– The storage subsystem logical drives and subsystems seem to be degraded.
(E-DDMs)
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Chapter 1. Introduction