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Chapter 5. Installing and replacing components
This chapter contains information about installing and replacing storage expansion
enclosure FRUs.
Attention: Static electricity can damage electronic devices and your system. To
avoid damage, keep static-sensitive devices in their static-protective packages until
you are ready to install them. Before replacing components, see "Handling
static-sensitive devices" on page 22.
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 EXP395 component unless the component's Service Action Allowed status LED
is lit.
Before you begin, ensure that you wear an anti-static wrist strap.
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 EXP395 to an existing and configured redundant drive
channel/loop pair
Notes:
1. The term drive loop or drive loop pair used in this publication might be referred
2. The EXP810 can be attached using the instructions in this section.
Before you begin, ensure that you wear an anti-static wrist strap.
© Copyright IBM Corp. 2009, 2013
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.
to as a drive channel or drive channel pair when referring to a DS3950 Storage
Subsystem in the DS3950 Storage Subsystem Installation, User's and Maintenance
Guide and other DS3950 Storage Subsystem publications. The terms have
identical meanings.
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