Chapter 5. Replacing components
This chapter contains information about replacing the storage subsystem and
expansion enclosure components and installing optional devices.
Attention: Always replace a failed component as soon as possible. The Recovery
Guru in the DS Storage Manager software identifies failed components.
OK to remove LED
Each controller, ESM, and power supply has a blue OK to remove LED. The
purpose of the OK to remove LED is to help ensure that a component is not
removed before it is safe to do so. Do not remove any component unless the
component OK to remove LED is lit.
Attention
If you remove a controller, ESM, or power supply when the OK to remove LED
is not lit, a loss of data availability can result. If an amber LED is lit and the
associated OK to remove LED is not lit, you must perform additional
diagnostics before you can remove the indicated component. Use the
Recovery Guru instructions in the Subsystem Management window or see the
applicable component replacement instructions in this chapter for the
additional diagnostics that are required in this case.
The OK to remove LED automatically turns on or off as conditions change. Wait at
least 2 minutes after you replace a component for the storage subsystem to
recognize the new component and update the LED status. In most cases, when a
single component fails, the OK to remove LED stays lit when the amber LED is lit
for the component.
Working with controllers
This section describes how to remove a controller, remove and install a cover,
install a controller, replace a controller, and dispose of the system-board battery on
the controller.
Removing a controller
Attention: Before you remove a controller in a single-controller storage
subsystem, shut down the storage subsystem to avoid data loss (see “Turning off
the storage subsystem” on page 81).
To remove a controller from the storage subsystem, complete the following steps:
1. Read the safety information that begins on page xiii and “Best practices
guidelines” on page 5.
Attention: Never remove a controller unless the OK to remove LED is lit.
Doing so can result in a loss of data.
2. If the controller has failed, do not continue with this procedure. Instead, go to
“Replacing a controller” on page 96.
Attention: Handle and install cables correctly to avoid degraded performance
or loss of communication with devices. See “Cabling the DS3500 storage
subsystem” on page 23 for more information.
© Copyright IBM Corp. 2010 93
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