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EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
Each global memory director has 16 ports with point-to-point serial
connections between the global memory director and channel or disk
directors (16 directors) through the direct matrix. Each memory
director port consists of a pair of full-duplex serial links—two serial
links out (TX) and two serial links in (RX).
Each of the eight director ports on the 16 directors connect to one of
the 16 memory ports on each of the eight global memory directors
(Figure 13 on page 84). These 128 individual point-to-point
connections facilitate up to 128 concurrent cache operations in the
system.
Figure 13 Global memory director to channel and disk director matrix
The DMX architecture ensures highest performance due to the
following:
â—† Requests for global memory are expedited to reduce locking.
â—† Requests are intelligently arbitrated to optimize available
resource usage.
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