This topic provides information to be aware of if you receive
errors that indicate the SAS cabling is not valid.
Check the following items:
- No more than five 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.
- No more than four expansion enclosures can be chained to port
2 (above the control enclosure). The connecting sequence from port
2 of the node canister is called chain 2.
- Do not connect a SAS cable between a port on an upper canister
and a port on a lower canister.
- In any enclosure, the same ports must be used on both canisters.
- No SAS cable can be connected between ports in the same enclosure.
- For any enclosure, the cables that are connected to SAS port 1
on each canister must attach to the same enclosure. Similarly, for
any enclosure, the cables that are connected to SAS port 2 on each
canister must attach to the same enclosure. Cable attachments for
SAS port 1 and cable attachments for SAS port 2 do not go to the same
enclosure.
- For cables connected between expansion enclosures, one end is
connected to port 1 while the other end is connected to port 2.
- For cables that are connected between a control enclosure and
expansion enclosures, port 1 must be used on the expansion enclosures.
- The last enclosure in a chain must not have cables in port 2 of
canister 1 and port 2 of canister 2.
- Ensure that each SAS cable is fully inserted.