EMC VNX Series Hardware Information Manual page 13

System component description
Disk drives
Each disk drive consists of one disk drive in a carrier. You can visually distinguish
between disk drive types by their different latch and handle mechanisms and by the type,
capacity, and speed labels on each disk drive. You can add or remove a disk drive while
the DPE is powered up, but you should exercise special care when removing disk drives
while they are in use. Disk drives are extremely sensitive electronic components.
Midplane
A midplane separates the front-facing disk drives from the rear-facing SPs. It distributes
power and signals to all components in the enclosure. SPs and disk drives plug directly
into the midplane.
Storage processor (SP) CPU
The SP CPU is the intelligent component of the 3U disk processor enclosure (DPE). Acting
as the control center, each SP CPU includes status LEDs, PCI Gen 2 x2 I/O module slots,
and LAN ports. The "DPE" section on page 26 provides more information.
Storage processor (SP) power supply
The SP power supply is located on the top, left side of the SP when viewed from the rear.
This module is an auto-ranging, power-factor-corrected, multi-output, off-line converter
with its own line cord. Each power supply includes status LEDs. A latch on the power
supply locks it into place to ensure proper connection. The "SP AC power supply" section
on page 28 provides more information.
EMI shielding
EMI compliance requires a properly installed electromagnetic interference (EMI) shield in
front of the DPE disk drives. When installed in cabinets that include a front door, the DPE
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.
VNX5500 Hardware Information Guide 13