IBM System Storage DS3300, Installation, User'S, And Maintenance Manual

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Chapter 5. Replacing components
This chapter contains information about replacing the storage subsystem
components.
Attention: Always replace a failed component as soon as possible. The Recovery
Guru in the DS3000 Storage Manager software identifies failed components.
Service action allowed LED
Each controller and power supply has a blue service action allowed LED. The
purpose of the service action allowed LED is to help ensure that a component is not
removed before it is safe to do so. Do not remove any DS3300 component unless
the component service action allowed LED is lit.
Attention
If you remove a controller or power supply when the service action allowed
LED is not lit, a loss of data availability can result. If an amber LED is lit and
the associated service action allowed LED is
not lit, you must perform
additional diagnostics before you can remove the indicated component. Use
the Recovery Guru instructions in the DS3000 Storage Manager Subsystem
Management window or see the applicable component replacement
instructions in this chapter for the additional diagnostics that are required in
this case.
The service action allowed 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 service action allowed LED stays lit when the amber
LED is lit for the component.
Removing a controller
Attention: Before you remove a controller in a single-controller DS3300, shut
down the DS3300 to avoid data loss (see “Turning off the storage subsystem” on
page 54).
To remove a controller from the storage subsystem, complete the following steps:
1. Read the safety information that begins on page xi and “Best practices
guidelines” on page 6.
Attention: Never remove a controller unless the service action allowed 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 66.
Attention: Handle and install I/O cables (such as SAS and Ethernet) correctly
to avoid degraded performance or loss of communication with devices. When
you work with I/O cables, do not pinch them, step on them, or locate them in
aisles or walkways. Do not overtighten the cable straps or bend the cables to a
radius smaller than 38 mm (1.5 in.).
3. Disconnect all attached interface cables from the failed controller. Be sure to
label each cable so that you can reconnect it correctly.
© Copyright IBM Corp. 2007, 2009
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