Task 3: Removing the disk unit from the auxiliary storage pool configuration

To remove the disk unit from the auxiliary storage pool (ASP) configuration, follow these steps.

If you are not already using dedicated service tools (DST), perform a manual initial program load (IPL) to start DST.
From the Use Dedicated Service Tools (DST) menu, follow these steps:
1. Select option 4 (Work with disk units).
2. Select option 1 (Work with disk configuration) on the Work with Disk Units display.
3. Select option 3 (Work with ASP configuration) on the Work with Disk Configuration display.

The Remove Units From Configuration display is shown.

                       Remove Units from Configuration
 
Type options, press Enter.
  4=Remove unit from configuration
 
                 Serial                     Resource
OPT  Unit  ASP   Number      Type   Model   Name            Status
      2     1    10-00A7529  9332   400     DD010           Configured
      3     1    10-00A4936  9332   400     DD012           Configured
      4     1    10-00A4936  9332   400     DD014           Configured
 4    5     1    10-00A7498  9332   400     DD015           Configured
 4    6     1    10-00A7498  9332   400     DD017           Configured
      7     1    10-00A7530  9332   400     DD018           Configured
      8     1    10-00A7530  9332   400     DD021           Configured

Type a 4 (Remove unit from configuration) in the OPT column for each unit that you want to remove and press the Enter key.
If the remove operation would leave the ASP with insufficient storage, you receive an error message.
If you see the Confirm Remove Disk Units display, skip to 6.

The Confirm Continuation display might be shown before the Confirm Remove Disk Units display if the storage management directories are not usable.
```
                              Confirm Continuation
 
To proceed, the system must perform internal processing
that might take several minutes during which the system might
appear inactive.
 
Press Enter to continue.
Press F12=Cancel to return and change your choice.
```
Determine whether you want to cancel the procedure or continue.
If you want to continue, press the Enter key.

The Confirm Remove Disk Units display is shown:

                             Confirm Remove Disk Units
 
Removing disk units will take several minutes.
 
Press Enter to confirm remove of disk units.
Press F9=Capacity information to display the capacity information.
Press F12=Cancel to return to change your choice.
 
 
                 Serial                     Resource
OPT   Unit  ASP  Number      Type   Model   Name            Status
 4      5    1   10-00A7498  9332    400    DD010           Configured
 4      6    1   10-00A7498  9332    400    DD012           Configured

Press F9 (Capacity information to display the resulting capacity.

                               Resulting Capacity
 
The configuration change that you requested would result in the
following ASP capacities.
 
Press Enter to continue.
               -----------Current----------  ----------Modified--------
               --Protected--  -Unprotected-  --Protected-- -Unprotected-
ASP   Threshold  Size  %Used   Size  %Used   Size   %Used   Size   %Used
 1        90%       0   0.00%  1600  52.70%     0    0.00%  1200   70.26%

Press the Enter key to return to the Confirm Remove Disk Units display.
Press the Enter key on the Confirm Remove Disk Units display to remove the selected units.
The system moves the data off the units selected to be removed to the remaining units in the source ASP. The remove can take several minutes or several hours during which the system appears inactive.
Notes:
- The time it takes to remove a unit depends on the disk unit type and model.
- If the data on the unit being removed is severely fragmented and the amount of storage used is high, the remove operation might take several hours.
When the remove operation is complete, you return to the Work with ASP Configuration display.

Press F3 until you return to the Use Dedicated Service Tools (DST) display.