Installing Hot-Swap Hard Disk Drives - IBM DS3950 User And Installation Manual

Table 20. Drive LED activity (continued)
LED
Activity and
Fault LEDs
Activity LED
Activity and
Fault LEDs
v Fibre-channel loop IDs: When you install an E-DDM in the storage expansion
v Hot-swap hardware: The EXP395 contains hardware that enables you to replace

Installing hot-swap hard disk drives

With the exception of the DS3950 storage subsystem initial power on, IBM
recommends that you add E-DDMs while the storage expansion enclosure is
turned on and running. Complete the following steps to install hot-swap E-DDMs
in the storage expansion enclosure:
Attention: After you remove a E-DDM FRU, wait 70 seconds before replacing or
reseating it to allow it to properly spin down. Failure to do so may cause
undesired events.
Before you begin, ensure that you wear an anti-static wrist strap.
1. Read the documentation that comes with the E-DDM.
2. Check for Fault LEDs shown in Figure 34 on page 71. If any amber LEDs are
70
IBM System Storage DS3950 EXP395 Storage Expansion Enclosure: Installation, User's, and Maintenance Guide
LED state
All unlit
Flashing once
every 2
seconds
Flashing
together in a
certain pattern
enclosure, 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 and the physical location (bay) of the E-DDM FRU.
a failed E-DDM without turning off the storage expansion enclosure. 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.
lit, see "Solving problems" on page 93.
Descriptions
Check for and resolve one of the following situations:
v EXP395 is turned off.
v EXP395 enclosure speed is not set correctly.
Check for and resolve one of the following situations:
v EXP395 is not connected to the DS3950 storage
subsystem.
v DS3950 storage subsystem controller firmware is not at
the required level to support the drive.
v Drives are part of an exported array. Once the array is
exported, the drives in the array are spun down in
preparation for being removed from the enclosure.
v Drives are not compatible. Incompatible drives are spun
down when they are inserted into the drive slots.
v Drives are failed by the storage subsystem controllers.
Drive failure due to the incorrect EXP395 enclosure speed
setting or internal drive hardware failures.