IBM System Storage Subsystem DS5020 - Manual (Page 158)

v E-DDM CRUs are not interchangeable between the DS5020 and other DS4000
storage subsystems.
Table 18. Drive LED activity
LED LED state Descriptions
Activity LED Flashing green The green LED flashes to indicate Fibre Channel activity to
the drive.
Activity LED Steady green The green LED lights to indicate that the drive is properly
installed and is spun up by the DS5020 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 DS5020 is turned off.
v DS5020 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 Storage subsystem controller firmware is not correct.
Note: Drives are spun down because they are in a "not
compatible state
″, ″exported state″, or ″locked state″ due to
an invalid security key.
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 an 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 DS5020 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 DS5020 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 an E-DDM CRU, wait 70 seconds before replacing or reseating
it to allow it to properly spin down. Failure to do so might cause undesired
events.
v The DS5020 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 79 on page 129. If any amber LEDs are
lit, see “Solving problems” on page 153.
128 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide