IBM Storwize V7000 Gen2+ Quick Installation Manual page 48

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
v No more than ten expansion enclosures can be chained to SAS port 2 of a node
v No cable can be connected between a port on a left canister and a port on a
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
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
v Ensure that cables are installed in an orderly way to reduce the risk of cable
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Storwize V7000 Gen2 and Gen2+: Quick Installation Guide
canister. The expansion enclosures in this chain should be installed below the
control enclosure (as shown in Figure 24 on page 27).
canister. The expansion enclosures in this chain should be installed above the
control enclosure (as shown in Figure 24 on page 27).
right canister.
expansion canister. Cables that split the connector out into separate physical
connections are not supported.
port 2 of canister 2.
damage when replaceable units are removed or inserted.