EMC VNX5500 - Page 73

Disk-array enclosure
VNX5500 Hardware Information Guide 73
Inter Connect Module (ICM) expander on the same side (A or B) of the 4U DAE is available.
Each expander manages the drives it is connected to. The only shared resources are the
LCC LED and the expander I
2
C (inter-integrated circuit) bus.
Power supply
In a 2U or 3U DAE, the power supply/cooling module integrates independent power
supply and blower cooling assemblies into a single module.
Each power supply is an auto-ranging power-factor-corrected, multi-output, off-line
converter with its own line cord. The drives and LCC have individual soft-start switches
that protect the disk drives and LCC if you install them while the disk enclosure is
powered up. A disk or blower with power-related faults will not affect the operation of any
other device.
In a 2U or 3U DAE, each power/cooling module has three status LEDs (Figure 66 on
page 77 and Figure 73 on page 83).
In a 4U DAE, the power supplies (“4U, 60 DAE AC power supply” on page 102) and cooling
modules are separated and located at opposite ends of the 4U DAE. The power supplies
are located on the rear of the 4U DAE while the cooling modules or fans are located on the
rear of the 4U DAE. The power supplies can be installed/removed from the rear of the DAE
while the cooling modules or fans can only be installed/removed by sliding the DAE
forward, then sliding the DAE cover to the rear. You access the cooling modules or fans
from the inside of the DAE (see the “Access to disk drives, LCCs, and cooling modules”
section on page 89 for more information).
Cooling modules
In a 2U or 3U DAE, the enclosure cooling system consists of dual-blower modules in each
power supply/cooling module.
In a 4U DAE, the cooling modules are separate from the power supply modules.
EMI shielding
EMI compliance requires a properly installed electromagnetic interference (EMI) shield in
front of the DAE disk drives. When installed in cabinets that include a front door, the DAE
includes a simple EMI shield. Other installations require a front bezel that has a locking
latch and integrated EMI shield. You must remove the bezel/shield to remove and install
the disk drives.