Recovering from a Failed ServeRAID II Adapter

Recovering from a Failed ServeRAID II Adapter

•  Recovering from a Hard Disk Drive Failure
•  Recovering from a Failed Server
•  Troubleshooting ServeRAID II Subsystems in a Cluster Environment

•  SCSI Bus Initiator_IDs
•  Adapter Host_ID
•  Cluster Partner Host_ID

•  The SCSI Bus Initiator_IDs for a nonshared SCSI channel are set to 7 by default. For shared SCSI  channels, the IDs will usually be 7 or 6 and must be different from 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, 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 II Adapter from your high-availability configuration.

To replace the ServeRAID adapter, do the following:

1.  Remove the failing ServeRAID adapter.

    For instructions on how to remove the ServeRAID II adapter, see the 'IBM ServeRAID II 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.

2.  Install the new ServeRAID II adapter.

    For instructions on how to install the ServeRAID II adapter, see the 'IBM ServeRAID II Installation and User's Guide'.
    Be sure to install the adapter to the same PCI slot from which you removed the failed ServeRAID II adapter.

     -Important- Do not reconnect the SCSI channel cables to the adapter at this time.

3.  Start the system from the IBM ServeRAID Configuration Diskette  Version 2.40, or higher.
4.  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.

5.  Ensure that the adapter has the latest BIOS/Firmware level.

    The BIOS/Firmware level of the adapter is displayed after system POST when the adapter BIOS/Firmware loads.
    The latest BIOS/Firmware levels are available from the Web site at

   http://www.pc.ibm.com/support

    When you have connected to this Internet address,file search for RAID BIOS. Download and read the  text file to determine the latest levels available.
    If your adapter BIOS/Firmware is downlevel, download and apply the BIOS/Firmware update.

6.  Update the configuration parameters.

    To update the configuration parameters:

   1.  Start the system from the IBM ServeRAID Configuration Diskette  Version 2.40, or higher.
   2.  Select Advanced Functions from the Main Menu.
   3.  Select Display/Change Adapter Params.
   4.  Using the settings that were assigned to the ServeRAID II adapter you are replacing, select and  configure each of the following parameters:
      •  SCSI Bus Initiator_IDs
      •  Adapter Host_ID
      •  Cluster Partner Host_ID

   5.  Select Change RAID Parameters from the Advanced Functions menu and enable unattended mode.

7.  Shut down and turn off the server.
8.  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 II adapter being replaced is the adapter that attaches to the server startup disk  array, other nonshared disk arrays, or shared arrays which have not failed over to the other server,  continue with the following steps; otherwise, restart the system normally.

9.  If the adapter that was replaced attaches the operating system startup disk array for the system or if  other nonshared disk arrays are attached to this adapter, start the system using the IBM ServeRAID  Configuration Diskette Version 2.40, or higher; and then:
   1.  Select Advanced Functions from the Main Menu.
   2.  Select Merge Group Management.
   3.  Restore the adapter disk array configuration.
   •  To restore nonshared 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 Nonshared 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
       start up 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 1-8) 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 1-8) 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.

10.  Restart your server.

     When all array configurations have been restored, the server can be restarted normally.

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