Note: A control enclosure can support up to 20 expansion enclosures (10 above
the control enclosure and 10 below the control enclosure).
6. 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 22 on page 24.
Note: A control enclosure can support up to 20 expansion enclosures (10 above
the control enclosure and 10 below the control enclosure).
7. If additional control enclosures are installed, repeat this cabling procedure on
each control enclosure and its expansion enclosures.
8. If additional control enclosures are installed, repeat this cabling procedure on
each control enclosure and its expansion enclosures.
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 23) is oriented
correctly.
v The orientation of the connector must match the orientation of the port before
you push the connector into the port. The cable connector and socket are keyed,
and it is important that you have proper alignment of the keys when the cable is
inserted.
v The blue pull tab must be below the connector.
v Insert the connector gently until it clicks into place. If you feel resistance, the
connector is probably oriented the wrong way. Do not force it.
v When inserted correctly, the connector can only be removed by pulling the tab.
v When both ends of a SAS cable are inserted correctly, the green link LEDs next
to the connected SAS ports are lit.
Guidelines
Guidelines (SSRs only)
Figure 23. SAS cable connectors
Chapter 2. Installing the system hardware 25
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