Each Storwize V3700 expansion unit ships with two expansion canisters. Each expansion canister provides
6 Gb SAS connectivity to the internal drives and two external 6 Gb SAS x4 ports (Mini-SAS HD SFF-8644
connectors labelled Port 1 and Port 2) that are used for connections to the Storwize V3700 node canisters
and for daisy chaining the expansion units between each other. The expansion port (Port 4) on the Storwize
V3700 node canister is connected to the Port 1 on the expansion canister. The Port 2 on the expansion
canister is connected to the Port 1 on the expansion canister in the adjacent enclosure, and so on.
The expansion unit connectivity topology is shown in the following figure.
Figure 7. Expansion unit connectivity topology
The following table lists ordering information for the expansion unit connectivity options.
Table 7. Expansion unit connectivity options
Description
Part
number
Feature
code
Maximum
quantity per one
expansion unit
0.6m SAS Cable (mSAS HD to mSAS HD) 00MJ176 ACTA 2*
1.5m SAS Cable (mSAS HD to mSAS HD) 00MJ178 ACTB 2*
3m SAS Cable (mSAS HD to mSAS HD) 00MJ180 ACTC 2*
* One cable per expansion canister; two cables are required per each expansion unit.
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