IBM Netfinity ServeRAID-4H Ultra160, User Reference

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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 you have installed 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 hard disk drives from the array in 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 the hard disk drives in the new server.
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 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
The SCSI initiator IDs for a non-shared SCSI channel are set to 7 by default. For
shared SCSI channels, the initiator IDs must be 7 or 6 and must be different from
the SCSI initiator IDs for the corresponding SCSI channels of the cluster partner
controller. Therefore, if you can obtain the SCSI initiator IDs for the
corresponding cluster partner system, you know the correct SCSI initiator IDs for
this system. For example, if the cluster partner system-shared SCSI initiator IDs
were set to 7, the controller you are replacing would need to have its SCSI
initiator IDs set to 6.
v
Controller and partner name
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IBM
®
Netfinity
®
User’s Reference: ServeRAID
™
-4H Ultra160 SCSI Controller