EMC Symmetrix DMX-3 User Manual

Symmetrix DMX-3 architecture
57
Symmetrix DMX-3 Hardware
The Symmetrix DMX systems require certain board types to occupy
particular slot locations within the card cage. Adhering to the
configurations stated for each model type ensures that the physical
routing of the serial signals minimizes contention for memory
resources, maximizes bandwidth within the system, and maintains
total redundancy to the same memory location through two
completely different hardware paths. Termination of TTL and GTLP
signals occurs at the adapters in the end slot locations.
DMX-3 slot
configuration
The Symmetrix DMX-3 midplane provides eight slots in the center of
the midplane reserved for global memory directors and the
remaining 16 slots are reserved for channel directors and disk
directors (eight to the left and eight to the right of memory). Figure 10
on page 57 shows the card cage layout for the global memory
directors, the Front-End (FE) and Back-End (BE) designations for the
Fibre Channel directors, and the FE designations for the ESCON
directors, FICON directors, iSCSI, or GigE Remote directors.
Figure 10 Symmetrix DMX-3 card cage configurations (front)
Dir
T ype
BE
Dir
T ype
FE
Dir
T ype
BE
Dir
T
ype
FE
Dir
ype
FE
Dir
T
ype
BE
Dir
T T ype
FE
or
Dir
Ty pe Type Type
BE
Dir
T T ype
BE
Dir
FE
Dir
ype
BE
Dir Dir
Dir
BE
M0
M1
M7 M6 M5 M4 M3
M2
FE*
or
FE*
or or
FE* FE*
BE FE
1 8 7 6 5 4 3 2
9
16 13
12 11 10
Dir
Type
14
Dir
Type
15
SYM-000085
FE
Type
FE
Ty pe
Global memory directors
M0 through M7
Director pairs
Global memory Director pairs
*Note: These slots (Directors 5, 6, 11, and 12) in the midplane can be configured with either front-end or back-end directors.

EMC Symmetrix DMX-3 Specifications

General

Brand	EMC
Model	Symmetrix DMX-3
Category	Storage
Language	English