Recovering From a Failed ServeRAID Adapter

Recovering From a Failed ServeRAID Adapter

The following configuration information is required to configure your new ServeRAID adapter:

SCSI Bus Initiator_IDs
Adapter Host_ID
Cluster Partner's Host_ID
Stripe Size
Unattended Mode

If the ServeRAID adapter you are replacing is functional, you can obtain the SCSI Bus Initiator_IDs, the Adapter Host_ID, the Cluster Partner's Host_ID, the stripe size, and the unattended mode by starting your server with the IBM ServeRAID Configuration Diskette and selecting the Display/Change Adapter Params item from the Advanced Functions menu.

If the ServeRAID adapter is not functional, you will need to refer to a record of the settings that was made when the adapter was previously configured.
If you do not have a record of the configuration information, the following hints might help you to assign the proper values.

The SCSI Bus Initiator_IDs for a non-shared SCSI channel are set to 7 by default. For shared SCSI channels, the IDs will usually be 7 or 6 and must be different than the SCSI Bus Initiator_IDs for the corresponding SCSI channels of the cluster partner adapter.
Therefore, if you can obtain the SCSI Bus Initiator_IDs for the corresponding cluster partner system, you can infer the correct SCSI Bus Initiator_IDs for this system.
For example, if the cluster partner system shared SCSI Bus Initiator_IDs were set to 7, then usually the adapter you are replacing would need to have its IDs set to 6.
To obtain the SCSI Bus Initiator_IDs from the corresponding cluster partner adapter, start the cluster partner system with the IBM ServeRAID Configuration Diskette and select the Display/Change Adapter Params option from the Advanced Functions menu.
The proper settings for the Host_ID and cluster partner Host_ID of the adapter being replaced can also be determined by reading the settings from the cluster partner system by using the Display/Change Adapter Params option.
The Host_ID for the new adapter must be identical to the cluster partner Host_ID value defined on the corresponding adapter in the cluster partner system, and the cluster partner Host_ID value for the new adapter must be identical to the Host_ID value defined on the corresponding adapter in the cluster partner system.

Use the following procedure to replace a failed ServeRAID Adapter from your high-availability configuration.

To replace the ServeRAID adapter, do the following:

Remove the failing ServeRAID adapter.
For instructions on how to remove the ServeRAID adapter, see the IBM ServeRAID-3H and ServeRAID-3L Ultra2 SCSI Adapters Installation and User's Guide .
Before you remove the adapter, be sure to:
1. Turn off the server.
2. Note which SCSI cables are connected to the SCSI channel connectors on the adapter.
3. Note which PCI slot has the adapter installed.
Install the new ServeRAID adapter.
For instructions on how to install the ServeRAID adapter, see the IBM ServeRAID-3H and ServeRAID-3L Ultra2 SCSI Adapters Installation and User's Guide .
Be sure to install the adapter to the same PCI slot from which you removed the failed ServeRAID adapter.
-Important- Do not reconnect the SCSI channel cables to the adapter at this time.
Start the system from the IBM ServeRAID Configuration Diskette Version 3.00 or later.
Initialize the adapter configuration.
To initialize the adapter:
1. Select Advanced Functions from the Main Menu.
2. Select Init/View/Synchronize Config.
3. Select Initialize Config.
Ensure that the adapter is at the latest BIOS level.
The BIOS level of the adapter is displayed after system POST when the adapter BIOS loads.
The latest BIOS levels are available from the IBM website at
http://www.pc.ibm.com/support
Once you have connected to this URL, search for RAID BIOS .
Download and read the text file to determine the latest levels available.
If your adapter BIOS is downlevel, download and apply the BIOS update.
Update the configuration parameters.
To update the configuration parameters:
1. Start the system from the IBM ServeRAID Configuration Diskette Version 3.00 or later.
2. Select Advanced Functions from the main menu.
3. Select Display/Change Adapter Params.
4. Using the settings that were assigned to the ServeRAID adapter you are replacing, select and configure each of the following parameters:
  - SCSI Bus Initiator_IDs
  - Adapter Host_ID
  - Cluster Partner's Host_ID
5. Select Change RAID Parameters from the Advanced Functions menu and enable unattended mode.
Shut down and turn off the server.
Reconnect the SCSI channel cables to the adapter.
Note: Be sure to connect the cables to the correct SCSI channels as noted in (above) step 1.
-Important- If the ServeRAID adapter being replaced is the adapter that attaches to the server startup disk array, other non-shared disk arrays, or shared arrays which have not failed over to the other server, continue with the following steps; otherwise, restart the system normally.
If the adapter that was replaced attaches the operating system startup disk array for the system or if other non-shared disk arrays are attached to this adapter, start the system using the IBM ServeRAID Configuration Diskette Version 3.00 or later and then:
1. Select Advanced Functions from the Main Menu.
2. Select Merge Group Management.
3. Restore the adapter disk array configuration.
  - To restore non-shared disk array configurations:
    1) Select Merge Group Management from the
    Advanced Functions menu; then, press Enter.
    A screen similar to the following appears.
    
    2) Select Merge/Unmerge Logical Drive and then press Enter.
    
    3) Select Merge Own Non-Shared Logical Drive.
    4) Select from the Group ID field the Merge Group ID for the array
    2xx
    where xx is the shared SCSI Bus Initiator_ID, and then press Enter.
    The Merge Group ID value is typically 206 or 207.
    A message appears at the bottom of the screen saying
    Merging own shared logical drive(s). Please wait...
    5) When the process completes, a message appears saying
    Merge/Unmerge operation completed successfully.
    Press any key to continue.
    6) Press Esc to return to the previous menu.
    Continue pressing Esc to return to the Main Menu.
    If the adapter you are replacing is the startup adapter, the system will now be able to startup the operating system properly.
  - To restore shared disk array configurations:
    Note: Usually all shared arrays will have failed over and will not need to be merged.
    1) Select Merge Group Management from the Advanced Functions menu; then, press Enter.
    A screen similar to the following appears.
    
    2) Select Merge/Unmerge Logical Drive and then press Enter.
    
    3) Select Merge Own Shared Logical Drive for each shared array
    (Merge Group IDs in the range from 1 to 8)
    that has not failed over to the cluster partner system
    (for example, RAID level 5 arrays in critical or degraded state)
    to restore the configuration of these shared arrays.
    4) Press Esc to return to the previous menu.
    Continue pressing Esc to return to the Main Menu.
    Repeat this process for each shared array
    (Merge Group IDs in the range from 1 to 8)
    that has not failed over to the cluster partner system
    (for example, RAID level 5 arrays in critical or degraded state)
    to restore the configuration of these shared arrays.
    -Important- The IBM ServeRAID Configuration Diskette must not be used to perform failover and failback to merge or unmerge drives belonging to the other server.
    Failover and failback to merge or unmerge drives belonging to the other server is normally handled by the operating system software and cluster support software.
Restart your server.
When the ServeRAID Mini-Configuration prompt appears, press Cntl+i to go to the mini-configuration program.
Select the ServeRAID adapter you are working on by using the Up Arrow ( ) or Down Arrow ( ) and then press Enter.
Select Advanced Functions.
Select Configure BIOS Settings.
Select BIOS Unattended Mode and press Enter to set it On.
Select Save Configuration to ServeRAID Controller and press Enter.
Once all array configurations have been restored, the server can be restarted normally.

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