Be aware of the following guidelines when you attach the cables to the SAS ports
in 2U expansion enclosures.
v No more than ten expansion enclosures can be chained to SAS port 1 of a node
canister. The expansion enclosures in this chain should be installed below the
control enclosure (as shown in Figure 24 on page 27).
v No more than ten expansion enclosures can be chained to SAS port 2 of a node
canister. The expansion enclosures in this chain should be installed above the
control enclosure (as shown in Figure 24 on page 27).
v No cable can be connected between a port on a left canister and a port on a
right canister.
v A cable must not be connected between ports in the same enclosure.
v A connected port on the node canister must connect to a single port on an
expansion canister. Cables that split the connector out into separate physical
connections are not supported.
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.
26 Storwize V7000 Gen2 and Gen2+: Quick Installation Guide
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