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CHAPTER 4: Installation and Initial Configuration
4.3 Installing a Cascaded Summit System
The ServSwitch Summit’s channel capacity can be easily expanded by installing a
cascade of Base Units as shown in Figure 4-7.
In a “two-tiered” cascaded system, one or more subsidiary Base Units are
connected to the channel ports of a master Base Unit. If you fully populate a
second tier, you can add a third tier by connecting additional subsidiary Base Units
to the channel ports of Base Units in the second tier. Three tiers is the maximum
depth of a cascaded system; only CIMs may be attached to the channel ports of
Base Units in the third tier. A three-tier system can accommodate up to 2048 CPUs.
NOTE
In cascaded configurations, the subsidiary Base Units in the third tier (if
there is one) must be powered ON first, then the subsidiary Base Units
in the second tier, then the master Base Unit. USMs can be powered ON
and OFF at any time as needed.
Figure 4-7. A sample cascaded system.
Subsidiary
Base Units
Second-tier CPUs
First-tier
CPUs
CIMs
CIMs
USMs
User stations
User stations
Master
16 x 64
Base Unit
