IBM DS4700 manual Installing hot-swap E-DDMs

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	The amber LED flashes to indicate that a drive has been
	amber	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	All unlit	Check for and resolve one of the following situations:
Fault LEDs		v DS4700 Express is turned off.
		v DS4700 Express link rate speed is not set correctly.
Activity LED	Flashing once	Check for and resolve one of the following situations:
	every 2	v The controller did not complete the boot process.
	seconds	v DS4000 storage subsystem controller firmware is not
		correct.
Activity and	Flashing	Drive failure due to the incorrect link rate speed setting or
Fault LEDs	together in a	internal drive hardware failures.
	certain pattern

vFibre-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.

vHot-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:

vAfter 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.

vThe 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