Storage Server Components - IBM TotalStorage DS4100 Installation, User's, And Maintenance Manual

v Before any planned system shutdown or after any system additions, removals, or
v Ensure that your system is in an optimal state before you shut it down. Never
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 server components

The following sections show the components of the DS4100 storage server.
Hot-swappable devices enable you to maintain the availability of your system while
you remove, install, or replace a hot-swap device. All DS4100 storage server
models support hot-swap SATA hard disk drives and cooling fan CRUs, so you can
remove and replace these components without turning off the storage server. In
addition, the DS4100 base storage server supports hot-swap RAID controllers and
power supplies.
the DS4000 storage expansion units attached to the DS4100 storage server
should be plugged into the same two independent external power circuits as the
DS4100. This ensures that the DS4100 storage server and all its attached
storage expansion units will have power if only one power circuit is available. In
addition, having all the right or all the left power supplies plug into the same
power circuit enables the components in the storage subsystem to power on
simultaneously during an unattended restoration of power. See Figure 56 on
page 62 for an example of redundant power connections.
Note: This guideline cannot be followed for the DS4100 single-controller storage
server, which does not offer redundant power supplies. However, you can
use Uninterruptible Power Supply (UPS) units with the DS4100
single-controller storage server to provide protection against power
brown-outs and short power outages.
modifications (including 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 the logical drives created for the DS4100 storage
server.
turn the power off if any fault light is lit; be sure to resolve any error conditions
before you shut down the system.
power-up sequence listed in "Turning on the storage server" on page 66. 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
"Turning on the storage server" on page 66 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 arrays are not displayed in the
DS4000 Storage Manager graphical user interface (GUI).
– The storage subsystem logical drives and arrays do not come online.
– The storage subsystem logical drives and arrays seem to be degraded.
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Chapter 1. Introduction