Exchanging a disk unit with device parity protection

Provides detailed procedure for exchanging a disk unit with device parity protection.

1. Does the failing unit have data parity protection that allows service without possible data loss (see Determine storage protection status)?
   • No: Customer data may be lost if serviced. Ask your next level of support for assistance. This ends the procedure.
   • Yes: Perform the following:
     1. Record the disk unit location and resource name for later use. If you do not already have the disk unit location information, use the location information in the Service Action Log (SAL). If the location is not available, find the address (see Addresses), which can be used to find the location.
     2. Exchange the failing disk unit with the system powered on (see Disk drive).
     3. If the concurrent procedure fails, go to step 4. Otherwise, continue with the next step of this procedure.
2. Perform the following:
   1. Select System Service Tools (SST). If you cannot get to SST, select Dedicated Service Tools (DST) (see Dedicated Service Tools (DST) for details).
      Note: Do not IPL the system to get to DST.
   2. From the Service Tools display, select Work with disk units > Work with disk unit recovery > Rebuild disk unit data.
   3. Does the resource name of the disk unit you just exchanged appear on the display as a unit that can be rebuilt?
      • Yes: Continue with the next step.
      • No: It can take up to five minutes for the input/output processor (IOP) to report the device to the system. Keep trying the Rebuild Disk Unit Data option until the device is available. If the Rebuild Disk Unit Data Failed display continues to appear even after 5 minutes, try a different disk unit or ask your next level of support for assistance. Once the device becomes available, continue with the next step.
3. Perform the following steps:
   1. Select the disk unit on the display with the resource name of the disk unit you just exchanged.
   2. Rebuild the disk unit data. When the new disk unit is rebuilt, the display will show that the status is complete (this may take 30 minutes or longer).
      Note: Once the rebuild has started, it is not necessary to wait to verify the array rebuild completes successfully.
   3. Return to the procedure that sent you here. This ends the procedure.
4. Perform the following:
   1. Ask the customer to stop all active applications on the system and power the system off with the Power Down System (PWRDWNSYS) command.
   2. Exchange the failing disk unit (see Disk drive).
   3. Perform an IPL to DST (see Dedicated Service Tools (DST)).
   4. From the Service Tools display, select Work with disk units > Work with disk unit recovery > Rebuild disk unit data.
   5. Select the disk unit on the display that was installed in place of the failing disk unit.
   6. Rebuild the disk unit data. When the new disk unit is rebuilt, the display shows that the status is complete (this may take 30 minutes or longer).
   7. After verifying that the status is complete, press Enter.
5. Perform the following:
   1. Return to the Use Dedicated Service Tools (DST) display.
   2. Select Perform an IPL to complete the IPL.
   3. Return to the procedure that sent you here. This ends the procedure.