IBM DS4700 EXPRESS, Installation, User'S, And Maintenance Manual

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Table 49. Drive LED activity (continued)
LED LED state Descriptions
Activity LED Steady green The green LED lights to indicate that the drive is properly
installed and is spun up by the DS4000 controller.
Fault LED Flashing
amber The amber LED flashes to indicate that a drive has been
identified by the software.
Fault LED Steady amber The amber LED lights to indicate a drive failure due to bad
or uncertified drive. The green activity LED might flash
once every 2 seconds, remain steady green, or be unlit.
Activity and
Fault LEDs All unlit Check for and resolve one of the following situations:
v
DS4700 Express is turned off.
v
DS4700 Express link rate speed is not set correctly.
Activity LED Flashing once
every 2
seconds Check for and resolve one of the following situations:
v
The controller did not complete the boot process.
v DS4000 storage subsystem controller firmware is not
correct.
Activity and
Fault LEDs Flashing
together in a
certain pattern Drive failure due to the incorrect link rate speed setting or
internal drive hardware failures.
v
Fibre-channel loop IDs: When you install a E-DDM in the storage subsystem,
the drive tray connects into a printed circuit board called the midplane . The
midplane sets the fibre-channel loop ID automatically, based on the setting of the
enclosure ID switch and the physical location (bay) of the drive CRU.
v Hot-swap hardware: The DS4700 Express contains hardware that enables you
to replace a failed E-DDM without turning off the storage subsystem. You can
continue to operate your system while an E-DDM is removed or installed. These
E-DDMs are known as hot-swap E-DDMs.
Installing hot-swap E-DDMs
With the exception of the DS4000 storage subsystem initial power up, add E-DDMs
while the storage subsystem is turned on and running. Complete the following steps
to install hot-swap E-DDMs in the storage subsystem:
Attention:
v After you remove a E-DDM CRU, wait 70 seconds before replacing or reseating
it to allow it to properly spin down. Failure to do so may cause undesired events.
v
The DS4700 Express and EXP810 E-DDMs and FRUs are not compatible with
the DS4200 Express and EXP420 EV-DDMs and FRUs.
1. Read the documentation that comes with the E-DDM.
2. Check for Fault LEDs shown in Figure 110 on page 154. If any amber LEDs are
lit, see “Solving problems” on page 183.
Chapter 5. Replacing components
153