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Chapter 5. Installing and replacing components
This chapter contains information about installing and replacing storage expansion
enclosure CRUs.
Attention:
avoid damage, keep static-sensitive devices in their static-protective packages until
you are ready to install them. For more information regarding handling
static-sensitive devices, see "Handling static-sensitive devices" on page 30.
Service Action Allowed Status LED
Each ESM and power supply and fan unit has a blue Service Action Allowed status
LED. The purpose of the Service Action Allowed status LED is to help ensure that a
component is not removed before it is safe to do so. Do not remove any EXP810
component unless the component's Service Action Allowed status LED is lit.
The Service Action Allowed status LED automatically turns on or off as conditions
change. Wait at least two minutes after you replace each component for the
controller to recognize the new component and update the LED status. In most
cases when a single component fails, the Service Action Allowed status LED turns
on steadily when the Needs Attention status LED is turned on for the component.
Adding the EXP810 to an existing and configured redundant drive
channel/loop pair
Note: The term drive loop or drive loop pair used in this publication might be
You can add up to seven EXP810s to a redundant fibre-channel loop pair. Some
DS4000 storage subsystems, like the DS4800s, support up to two redundant drive
loop pairs. Before you cable your EXP810 to a drive loop, refer to the Installation,
User's and Maintenance Guide that came with your storage subsystem for specific
instructions.
© Copyright IBM Corp. 2006, 2009
Static electricity can damage electronic devices and your system. To
Attention
Never remove an ESM or power supply and fan unit unless the Service Action
Allowed status LED is turned on. Doing so can result in a potential loss of
data availability. If the Needs Attention LED is lit and the associated Service
Action Allowed status LED is not lit, then you must perform additional
diagnostics before you can remove the indicated component. Use the
Recovery Guru instructions in the DS Storage Manager Subsystem
Management window or refer to the appropriate component replacement
instructions in this chapter for the additional diagnostics required in this case.
referred to as a drive channel or drive channel pair when referring to a
DS4800 Storage Subsystem in the DS4800 Storage Subsystem Installation,
User's and Maintenance Guide and other DS4800 Storage Subsystem
publications. The terms have identical meanings.
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