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 198.
v Verify that the SAS cabling to the expansion enclosure is correctly installed. To
review the requirements, see “Problem: SAS cabling not valid” on page 194.
Problem: Mirrored volume copies no longer identical
The management GUI provides options to either check copies that are identical or
to check that the copies are identical and to process any differences that are found.
To confirm that the two copies of a mirrored volume are still identical, choose the
volume view that works best for you. Select one of the volume copies in the
volume that you want to check. From the Actions menu, select the Validate
Volume Copies option.
You have the following choices:
v Validate that the volume copies are identical.
v Validate that the volume copies are identical, mark, and repair any differences
that are found.
If you want to resolve any differences, you have the following options:
v Consider that one volume is correct and make the other volume copy match the
other copy if any differences are found. The primary volume copy is the copy
that is considered correct.
v Do not assume that either volume copy is correct. If a difference is found, the
sector is marked. A media error is returned if the volume is read by a host
application.
Problem: Code not processed from USB key
This topic helps you resolve why the code was not processed using a USB key.
You might encounter this problem during initial setup or when running commands
if you are using your own USB key rather than the USB key that was packaged
with your order.
Chapter 5. Control enclosure 195
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