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Connecting SAS cables to expansion enclosures
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34
Storwize V3700: Quick Installation Guide
This task applies if you are installing one or more expansion enclosures to a
control enclosure.
Before you begin
If you purchased disk drives that were not pre-installed for you, you must install
all of the drives before connecting the SAS cables to the expansion enclosures.
About this task
This task applies if you are installing one or more expansion enclosures. You can
attach up four expansion enclosures to the control enclosure.
Note: When inserting SAS cables, make sure the connector (Figure 25) is oriented
correctly.
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.
Figure 25. SAS cable connectors
Be aware of these guidelines when you begin to attach the cables to the SAS ports:
v No more than two expansion enclosures can be chained to port 1 (below the
control enclosure). The connecting sequence from port 1 of the node canister is
called chain 1.
v No cable can be connected between a port on an left canister and a port on a
right canister.
v Attach cables serially between enclosures; do not skip an enclosure.
v The last enclosure in a chain must not have cables in port 2 of canister 1 and
port 2 of canister 2.
v Ensure that cables are installed in an orderly way to reduce the risk of cable
damage when replaceable units are removed or inserted.
v Arrange your cables to provide access to:
– USB ports. USB port access is required when you use a USB flash drive to
configure the system.
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