IBM Storwize V7000, Troubleshooting And Maintenance Manual

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A number of different conditions are reported as location errors. Each condition is
indicated by different node error. To find out how to resolve the node error, go to
“Procedure: Fixing node errors” on page 61.
Be aware that after a node canister has been used in a system, the node canister
must not be moved to a different location, either within the same enclosure or in a
different enclosure because this might compromise its access to storage, or a host
application's access to volumes. Do not move the canister from its original location
unless directed to do so by a service action.
Problem: 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
This topic helps you resolve why a newly installed expansion enclosure was not
detected by the system.
When installing a new expansion enclosure, follow the management GUI Add
Enclosure wizard, which is available from the
Manage Devices Actions menu.
If the expansion enclosure is not detected, perform 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 system status using the LEDs” on page 54.
Chapter 6. Resolving a problem
49