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v Before any planned system shutdown or after any system additions, removals, or
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 should recover automatically from an
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 16 500 GB SATA Enhanced Value Disk Drive Modules (EV-DDMs)
v Two RAID controllers
v Two power supply and fan units
v Two controller cache battery back up units
Enhanced Value Disk Drive Modules (EV-DDMs)
This section shows the location of hot-swap Enhanced Value Disk Drive Modules
(EV-DDMs). The hot-swap features enable you to remove and replace SATA
EV-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.
The hot-swap drive bays that are accessible from the front of your storage
subsystem are shown in Figure 1 on page 7.
6
IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
enables the DS4000 devices in the configuration to power on simultaneously
during an unattended restoration of power.
Note: Do not overload the circuits that power your storage subsystem and
storage expansion enclosures. Use additional pairs of AC power
distribution units (PDUs) if necessary. Refer to Table 12 on page 18 for
information on storage subsystem power requirements. Contact your IBM
service representative for additional information if needed.
modifications (including firmware updates, logical drive creations, storage
partitioning definitions, hardware changes, and so on), save the storage
subsystem profile as explained in the DS4000 Storage Manager guide for your
operating system. Save the profile in a location other than in the logical drives
created for the DS4200 Express.
power-up sequence listed in "Powering on the storage subsystem" on page 81.
Check that each component of the subsystem is powered-on in the proper order
during this entire power-up procedure to ensure the controller will be able to
optimally access all of your storage subsystems.
components; however, you should always follow the power-up sequence listed in
"Powering on the storage subsystem" on page 81 during any attended power-up
procedure.
unexpected 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
DS4000 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.
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