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Figure 72. Connecting the SAS cables
2. To add a second expansion enclosure chain to the control enclosure, use the supplied SAS cables to
connect the control enclosure to the expansion enclosure at rack position 2. Refer to Figure 72 on
page 73 for an example.
3. If additional expansion enclosures are installed, connect each one to the previous expansion
enclosure in a chain. Use two Mini SAS HD to Mini SAS HD cables, as shown in Figure 72 on page 73.
Note: A control enclosure can support up to 20U of expansion enclosures in two chains: 10Uin the
upper chain (above the control enclosure) and 10U in the lower chain.
4. If additional control enclosures are installed, repeat this cabling procedure on each control enclosure
and its expansion enclosures.
When using more than one control enclosure, divide the total number of expansion enclosures among
the control enclosures to enhance performance.
SAS cabling guidelines
When connecting SAS cables between 2U expansion enclosures, you must follow a list of guidelines to
ensure that your configuration is valid.
Orienting the connector
When inserting SAS cables, make sure the connector (Figure 73 on page 74) is oriented correctly.
Chapter 2. Installing the system hardware 73
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