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EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
Symmetrix DMX-3
and component
scaling attributes
The Symmetrix DMX-3 base configurations are composed of a system
bay and independent storage bays, that have common configuration
guidelines. Any DMX-3 base configuration accommodates the later
addition (upgrade) of capacity through the on-line addition of drives,
drive enclosures, if required, and additional storage bays that support
up to 1,920 2 Gb/s or 4 Gb/s disk drives. The Direct Matrix
â„¢
infrastructure accommodates nondisruptive addition of disk directors
(increasing from two to eight disk directors) enabling increased
capacity when needed.
The DMX-3 consists of a system bay and from one to eight storage
bays. The DMX-3 system bay has from two to eight disk directors, up
to 12 channel directors (combined director total 16), and two, four, six,
or eight global memory directors. The system bay also contains up to
eight power supplies, each of which has a dedicated 2.2 kW BBU.
Table 9 on page 51 describes the available DMX-3 configurations.
Table 8 Symmetrix DMX-3 storage bay component overview
Component Description
Drive enclosures The Symmetrix DMX-3 storage bay is configured with capacities of 120 or 240 disk drives. Each
drive enclosure includes the following components:
• Redundant power and cooling modules for disk drives
• Two Link Control Cards (LCC)
• From 4 to 15 Fibre Channel disk drives per drive enclosure
The storage bays can be populated with any combination of DMX disk drives (73 GB, 146 GB, and
300 GB 10,000 rpm drives; 73 GB, 146 GB, and 300 GB, and 450 GB 15,000 rpm drives; and 500
GB 7,200 rpm drives) Some configuration restrictions may apply.
Battery backup unit (BBU)
modules
Two BBU modules are required for four drive enclosures (up to eight BBU modules support up to
16 drive enclosures in one storage bay). The BBU modules provide backup power to the drive
enclosures.
Power distribution panel (PDP),
Power distribution unit (PDU),
and AC connectors
Two PDPs, one for each zone, provide a centralized cabinet interface and distribution control of the
AC power input lines when connected to the storage bay PDUs. The PDPs contain the manual
On/Off power switches, which are accessible through the rear door. The PDUs, one for each
power zone, provide the main interface between the input AC from the PDPs and the BBU
modules to the drive enclosures contained within the storage bay.
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