Error codes
Error codes are displayed on the front panel display.
For descriptions of the error codes that are displayed on the front panel display,
see the various error code topics for a full description of the failure and the actions
that you must perform to correct the failure.
Hardware boot
The hardware boot display shows system data when power is first applied to the
node as the node searches for a disk drive to boot.
If this display remains active for longer than 3 minutes, there might be a problem.
The cause might be a hardware failure or the software on the hard disk drive is
missing or damaged. Refer to the topic on determining a hardware boot failure.
Node rescue request
If software is lost, you can use the node rescue process to copy all software from
another node.
The node-rescue-request display shows that a request has been made to exchange
the software on this node. The SAN Volume Controller software is preinstalled on
all SAN Volume Controller nodes. This software includes the operating system, the
application software, and the SAN Volume Controller publications. It is normally
not necessary to replace the software on a node, but if the software is lost for some
reason (if the hard disk drive in the node fails), it is possible to copy all the
software from another node connected to the same fibre-channel fabric. This
process is known as node rescue.
Power failure
The SAN Volume Controller runs on battery power when main power is lost.
The Power failure display shows that the SAN Volume Controller is running on
battery power because main power has been lost. All I/O operations have stopped.
The node is saving cluster metadata and node cache data to the internal disk drive.
When the progress bar reaches zero, the node powers off.
Note: When input power is restored to the uninterruptible power supply, the SAN
Volume Controller turns on without the front panel power button being
pressed.
142 IBM System Storage SAN Volume Controller: Hardware Installation Guide
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