48
EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
Table 7 Symmetrix DMX-3 system bay component overview
Component Description
Cooling fan modules Three 3-fan modules maintain air circulation and cool the unit internally.
Card cage and midplane The front 24 slots contain global memory directors, disk directors, and channel directors (front-end
Fibre Channel, ESCON, FICON, and iSCSI channel directors
a
, or GigE Remote directors). The rear
slots contain the channel host adapters, GigE Remote adapters, disk adapters, and the
Communications and Environmental Control Modules (XCMs).
Channel directors/adapters
and remote director
adapters
(front-end)
a
Up to 12 channel directors connect to the front side of the midplane and the adapters to the rear
side of the midplane in the system cabinet. Each channel director’s adapter provides the interface to
the host or network.
Fibre Channel Disk
Directors/Adapters
(Back-End)
Two, four, six or eight disk directors connect to the midplane in the front of the cabinet. Each disk
director’s adapter provides the interface to the Fibre Channel disk drives. The adapter connects to
the opposite side of the midplane in the rear of the cabinet.
Global memory directors Two, four, six, or eight global memory directors provide up to 512 GB (256 GB effective) total global
memory, available in 8 GB, 16 GB, 32 GB, and 64 GB global memory director capacities.
Communications and
environmental control
module (XCM)
Two communications and environmental control modules (XCMs) connect to the midplane in the
rear card cage. The XCM contains the Ethernet interface between the directors (channel, disk, and
memory) and the service processor. It monitors and logs environmental events for all Symmetrix
DMX-3 FRUs (field replacable units) and reports any operational problems such as thermal
excursion, voltage drop, etc. It also has connectors for paths between the XCM and the BBU
modules (in the system bay and the storage bays) for sending commands and receiving status.
Power supplies Up to eight power supplies support the system bay and are split between two (A and B) three-phase
power zones. Each zone supports up to four power supplies. One zone can maintain power for the
entire system bay independent of the power supplies in the other zone. The DMX-3 is available in
three-phase Delta or three-phase WYE configurations.
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 system 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 various components
contained within the system bay.
Battery backup unit (BBU)
assembly consisting of two
BBU modules
Up to eight BBU modules provide backup for each of the power supplies. If AC power fails, the BBU
modules can maintain power for two 5-minute periods of AC loss while the Symmetrix system shuts
down.
Service processor
(keyboard, video display,
and mouse - KVM), server,
and uninterruptible power
supply (UPS)
The service processor consists of a KVM and a server that connects to the Symmetrix subsystem
through an Ethernet interface. The service processor uses an external modem for communicating
with the EMC Customer Support Center when the Symmetrix system detects an error condition.
The service processor is used to download the Symmetrix system configuration to the directors and
provides diagnostic and maintenance utilities for the Symmetrix system. The server battery backup
is provided by a UPS.
a. Contact your local EMC Sales Representative for current channel director availability.
To Next Page
Loading...
Need help?
General
