The DCS3700 has the following removable components. These components, called field replaceable units
(FRUs), are accessible from the front or back of the enclosure.
v Five drive drawers, including the right and left cable chains.
v 20 minimum to 60 maximum Disk Drive Modules (DDMs)
v Two RAID controllers (for the 1818-80C)
v Two environmental service modules (ESMs) (for the 1818-80E)
v Two power supplies
v Two fan assemblies
The hot-swap features of the DCS3700 enable you to remove and replace DDMs, power supplies, fan
assemblies, ESMs, and Raid controllers without turning off the storage expansion enclosure. You can
maintain the availability of your system while a hot-swap device is removed, installed, or replaced.
The DCS3700 expansion unit is the storage expansion enclosure specifically designed for use with the
DCS3700 storage system. The DCS3700 can support up to two DCS3700 expansion enclosures for a total
of 180 disk drive modules (DDM).
Drive drawers
Both the DCS3700 storage system and DCS3700 expansion enclosure have five removable drive drawers
that are accessible from the front of the enclosure (see Figure 2 on page 8). Each drive drawer can contain
up to 12 disk drives (see Figure 3 on page 8). With the drive drawers fully populated, the DCS3700 can
support up to 60 DDMs.
Note: Drive drawers might be also referred to as drive trays in other publications.
Figure 1. Isometric view of the DCS3700
Chapter 1. Introduction 7
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