IBM ServeRAID-4 Ultra160 Series, User Reference

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Troubleshooting an IBM ServeRAID Cluster Solution
There is the possibility that one of the servers, one of the ServeRAID controllers, or
one of the hard disk drives in a cluster might fail. This section presents procedures
you can take to recover from these potential problems. If you still have problems
after following these procedures, contact your IBM service representative for further
information. Also, you can find hints and tips to help you solve problems on the IBM
Support Web site. See “Downloadable files from the World Wide Web” on page 131
for additional information.
Recovering from a failed ServeRAID server
When replacing a failed server in a high-availability configuration, you might not
need to replace the ServeRAID controller. However, if you replace your ServeRAID
controller, you must reconfigure the controller after installing your new server.
Important
The following procedure requires specific configuration settings for the ServeRAID
controller. If the server and controller that are being replaced are functional, you can obtain
these settings from the controller. However, if the controller or the server is not functional,
you will need a record of these settings, such as one that was created when the controller
was previously configured. If you are replacing your ServeRAID controller with your server,
you must have correct configuration information to complete this procedure.
Use the following procedure to recover from a failed server:
1. Shut down the failed server.
2. Remove all local hard disk drives from the failed server.
As you remove your hard disk drives, be sure to note the bay in which each
drive was installed. If you are replacing your failed server with an identical
server, you can reinstall the drives in an identical configuration and get your
server up and running quickly.
3. If the ServeRAID controller is functional, remove it from the failed server. As you
remove the controller from the failed server, be sure to note the following:
v
Which SCSI cables are connected to the SCSI channel connectors on the
controller.
v
Which PCI slot has the controller installed.
4. Install all the local hard disk drives into the new server, using the location
information you recorded in step 2.
For information on how to install a hard disk drive, see the documentation that
comes with your server. If you are replacing the failed server with an identical
server, install each hard disk drive in the same bay as the one it was removed
from in the failed server.
5. If the ServeRAID controller in the failed server is not functional, or if you are not
sure, continue with “Recovering from a failed ServeRAID controller”. Otherwise,
perform the following steps with the functional ServeRAID controller:
a. Install the controller in the new server.
b. Reinstall the cables as they were in the failed server.
c. Start the server.
Recovering from a failed ServeRAID controller
You must have the following configuration information to configure your new
ServeRAID controller:
v
SCSI initiator IDs
Chapter 18. Solving ServeRAID problems
151