Removing and installing the cache battery pack

To service the cache battery pack, complete the following procedure:

1. Begin with power on.

   To prevent data loss, the cache battery pack must be in an error state before it is removed from the system.

   If you have powered the system off, power it on before you continue.

2. Select your operating system:
   • AIX: Go to step 3
   • Linux: Go to step 5
   • IBM i: Go to step 7
3. Force the cache battery pack into an error state on AIX® (to prevent possible data loss), as follows:
   1. Navigate to the IBM® SAS Disk Array Manager by using the following steps:
      1. At the command prompt, type smit, and press Enter.
      2. Select Devices.
      3. Select Disk Array.
      4. Select IBM SAS Disk Array.
      5. Select IBM SAS Disk Array Manager from the menu with options for configuring and managing the IBM SAS RAID Controller.
   2. Select Diagnostics and Recovery Options.
   3. Select Controller Rechargeable Battery Maintenance.
   4. Select Force Controller Rechargeable Battery Error.
   5. Select the IBM SAS RAID Controller whose battery you want to replace.
   6. This option places the battery into the error state, which requires it to be replaced.
   7. Determine that it is safe to replace the cache battery pack. See the following Displaying Rechargeable Battery Information procedure. It is safe to replace the cache battery pack when Yes is displayed next to Battery pack can be safely replaced. You might need to reselect the option Display Controller Rechargeable Battery Information multiple times as it might take several minutes before it is safe to replace the cache battery pack.
   8. Verify that the Cache Present LED is not flashing.
   Displaying Rechargeable Battery Information

   1. Navigate to the IBM SAS Disk Array Manager by using the previous procedure.
   2. Select Diagnostics and Recovery Options.
   3. Select Controller Rechargeable Battery Maintenance.
   4. Select Display Controller Rechargeable Battery Information.
   5. Select IBM SAS RAID Controller.
4. Go to step 8.
5. Force the cache battery pack into an error state on Linux (to prevent possible data loss), as follows:
   1. Run the iprconfig utility by typing iprconfig.
   2. Select Work with disk unit recovery.
   3. Select Work with resources containing cache battery packs.
   4. Select your adapter and type 2. Then press Enter to force the battery error.
      Note: This option places the battery into the error state, which requires it to be replaced.
   5. If you are sure you want to force a battery error, type c to confirm. If you do not want to force a battery error, type q to cancel.
   6. Determine that it is safe to replace the cache battery pack. See Displaying Rechargeable Battery Information.
   7. It is safe to replace the cache battery pack when Yes is displayed next to Battery pack can be safely replaced. You might need to reselect the option Display Controller Rechargeable Battery Information multiple times as it might take several minutes before it is safe to replace the cache battery pack.
6. Go to step 8.
7. Force the cache battery pack into an error state on IBM i (to prevent possible data loss), as follows on the system or partition that contains the adapter:
   1. Be sure that you are signed on to the system with at least service level authority.
   2. Type strsst on the command line and press Enter.
   3. Type your service tools user ID and service tools password on the System Service Tools (SST) Sign On display. Press Enter.
   4. Select Start a Service Tool from the System Service Tools (SST) display and press Enter.
   5. Select Hardware Service Manager from the Start a Service Tool display and press Enter.
   6. Select Work with resources containing cache battery packs from the Hardware Service Manager display and press Enter.
   7. Select Force battery pack into error state for the I/O card that you are working with from the Work with Resources containing cache battery packs display and press Enter.
   8. On the Force Battery Packs Into Error State display, verify that the correct I/O adapter has been selected and press the function key that confirms your choice.
   9. Return to the Work with Resources containing cache battery packs display and select Display battery information. Ensure that the field Safe to replace cache battery is set to Yes. This might take several minutes and you might need to press the refresh key to see the field update.
8. Place a rack-mounted system into service position. Go to Placing a rack-mounted 8233-E8B or 8236-E8C in the service position
9. Remove the service access cover. Go to Removing the service access cover from a rack-mounted 8233-E8B or 8236-E8C
10. Check cache battery LED by examining the LED on the cache battery pack (C).
    

    Is the cache battery LED flashing?
    Yes, the LED is flashing	No, the LED is not flashing.
    ↓	Go to step 12.

11. Stop removing the cache battery pack

    The flashing LED indicates that there is cached data on the battery that has not been saved. This data will be lost if the battery is removed at this time. Complete this service procedure without replacing the battery, and then retry it to ensure all cache data is saved before the battery is replaced.

    
    Go to step 18.
12. Remove the cache battery pack as follows:
    Attention: Do not remove the cache battery if the LED (C) is flashing because this indicates cache data exists.

    1. While applying pressure downward on the card to ensure that it remains seated, move the cache battery lever (A) away from the connector to disengage the battery from the connector.
    2. Slide the cache battery pack (B) out of the mounting guides and remove it from the controller.
    
13. Install the cache battery pack as follows:
    Attention:

    Ensure that the cache battery pack is disconnected for at least 60 seconds before you connect the new battery. This is the minimum amount of time needed for the card to recognize that the battery has been replaced.

    1. Slide the cache battery pack (B) into the mounting guides on the controller until it is seated in the battery connector (C).
    2. After the battery is seated in the connector, move the lever (A) to the latched position to fully seat the battery into the connector.
    
14. Restart the adapter's write cache by doing the following steps:

    Select your operating system:

    • AIX: Go to step 15
    • Linux: 16
    • IBM i: Go to step 17
15. Perform the following steps:
    1. Navigate to the IBM SAS Disk Array Manager by using the information in step 3a.
    2. Select Diagnostics and Recovery Options.
    3. Select Controller Rechargeable Battery Maintenance.
    4. Select Start Adapter Cache.
    5. Select the controller with the battery you just replaced and press Enter.
    6. Go to step 18.
16. Perform the following steps:
    1. Run the iprconfig utility by typing iprconfig.
    2. Select Work with disk unit recovery.
    3. Select Work with resources containing cache battery packs.
    4. Start the I/O adapter cache on the adapter for the battery that you just replaced by typing 3 and press Enter.
    5. Go to step 18.
17. Perform the following steps:
    1. Return to the Work with Resources containing Cache Battery Packs display using the information in step 7a to 7f and select the Start IOA cache. Press Enter.
    2. Ensure that you get the message Cache was started.
    3. Go to step 18.
18. Install the service access cover. Go to Installing the service access cover on a rack-mounted 8233-E8B or 8236-E8C
19. Place into operating position. Go to Placing the rack-mounted 8233-E8B or 8236-E8C in the operating position
20. Close the back door on the unit you are servicing.
21. Verify that the new resource is working correctly, as described in Verifying the installed part.