14 EMC VNX5400 Hardware Information Guide
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 type,
capacity, and speed labels on each disk drive. You can add or remove a disk drive while
the 3U DPE is powered up, but you should exercise special care when removing modules
while they are in use. Disk drives are extremely sensitive electronic components.
When calculating the number of drives for your VNX5400 platform, the DPE is included in
the total drive slot quantity of 250 drives. If the total drive slot quantity exceeds 250, you
will not be able to add another DAE. Refer to the “Disk-array enclosures” section on
page 69 for more information about the available expansion DAEs for the VNX5400
platform.
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 CPU
The storage process (SP) CPU is the intelligent component of the 3U disk processor
enclosure (DPE). Acting as the control center, each SP CPU includes status LEDs. The “3U,
25 (2.5-inch) disk processor enclosure” section on this page provides more information.
Storage processor dual fan pack (cooling module)
When viewed from the front, each SP CPU module has two dual fan packs located on the
bottom of the SP. Each dual fan pack includes an amber fault LED. Latches on the fan pack
lock it into place to ensure proper connection. The “Storage processor dual fan pack
(cooling module)” section on page 17 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.
3U, 25 (2.5-inch) disk processor enclosure
The 25 (2.5-inch) disk processer enclosure (DPE) includes the following:
◆ 2.5-inch 6-Gb/s SAS or Flash disk drives (hot-swappable)
◆ Status LEDs
◆ CPU latches
◆ Fan packs and latches
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