Working With Hot-Swap Cooling Fans; Fan Locations - IBM TotalStorage DS4300 Installation, User's, And Maintenance Manual

10. Use the Storage Manager client to configure the additional space on the new

Working with hot-swap cooling fans

The storage subsystem cooling system consists of two fan CRUs, each containing
two fans. The fan CRUs circulate air inside the unit by pulling in air through the
vents on the front of the drive CRUs and pushing out air through the vents in the
back of each fan CRU. See Figure 91.
If two fans fail, or the fans cannot maintain an internal temperature below 70°C
(158°F), the power supplies in the unit will automatically shut down (an
over-temperature condition). If this occurs, you must cool the unit and restart it. See
"Restoring power after an over-temperature shutdown" on page 96.
Attention:
air. These fans are hot-swappable and redundant; however, when one fan fails, you
must replace the fan CRU within 48 hours to maintain redundancy and optimum
cooling. When you replace the failed fan CRU, be sure to install the second fan
CRU within 10 minutes to prevent any overheating due to the lack of the additional
fan CRU.
Fault LED
Figure 91. Fan locations
Fan CRUs
Note: The Drive fault LEDs might flash intermittently while the drives spin up.
v If the Drive activity LED is off, the drive CRU might not be installed correctly.
Remove the drive CRU, wait 30 seconds, and then reinstall it.
v If the Drive fault LED stays on or the Drive activity LED stays off, the new
drive might be faulty. See the Storage Manager client for problem
determination.
8. Use the Storage Manager client to monitor the status of the new drive and the
progress of the data reconstruction. Wait for data reconstruction to finish. (The
Drive activity LED stops flashing.)
Note: The Drive activity LED will continue to flash after reconstruction is
finished if there is I/O activity to that drive. In that case, use the host
software to determine if the data reconstruction is finished.
9. When reconstruction is finished on the new drive, repeat step 5 on page 128
through step 8 for each additional drive that you want to install.
drives.
The fans in the storage subsystem draw in fresh air and force out hot
Fan CRU
Latch Handle
The two fan CRUs are hot-swappable and redundant.
Latch Handle
Fan CRU
Chapter 5. Installing and replacing components
Fault LED
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