v Ensure that each SAS cable is fully inserted.
See the topic about installing SAS cables in the IBM Storwize V7000 Gen2 Quick
Installation Guide.
Problem: Storwize V7000 Gen1 SAS cabling not valid
This topic provides information to be aware of if you receive errors that indicate
the SAS cabling is not valid.
Check the following items:
v 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.
v 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.
v Do not connect a SAS cable between a port on an upper canister and a port on a
lower canister.
v In any enclosure, the same ports must be used on both canisters.
v No SAS cable can be connected between ports in the same enclosure.
v 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.
v For cables connected between expansion enclosures, one end is connected to port
1 while the other end is connected to port 2.
v For cables that are connected between a control enclosure and expansion
enclosures, port 1 must be used on the expansion enclosures.
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 each SAS cable is fully inserted.
Problem: New expansion enclosure not detected
Determine why a newly installed expansion enclosure was not detected by the
system.
When you install a new expansion enclosure, follow the management GUI Add
Enclosure wizard. Select Monitoring > System. From the Actions menu, select
Add Enclosures.
If the expansion enclosure is not detected, complete the following verifications:
v Verify the status of the LEDs at the back of the expansion enclosure. At least one
power supply unit must be on with no faults shown. At least one canister must
be active, with no fault LED on, and all the serial-attached SCSI (SAS) port 1
LEDs must be on. For details about the LED status, see “Procedure:
Understanding the Storwize V7000 Gen1 system status using the LEDs” on page
262.
v Verify that the SAS cabling to the expansion enclosure is correctly installed. To
review the requirements, see “Problem: Storwize V7000 Gen1 SAS cabling not
valid.”
248 Storwize V7000 Unified: Problem Determination Guide 2073-720
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