Stopping disk compression

Use this procedure to stop disk compression by using the dedicated service tools (DST).

1. If you are not already using DST, perform a manual initial program load (IPL) to start DST.
2. From the Use Dedicated Services 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 6 (Work with disk compression) on the Work with Disk Configuration display.
3. Select option 3 on the Work with Disk Compression display.

                        Work with Disk Compression
    
   Select one of the following:
    
        1. Display disk compression status
        2. Start compression on disk units
        3. Stop compression on disk units
    
    
    
    
   Selection
    
   F3=Exit     F12=Cancel

4. Select the disk units that you want to stop compression on from the Select Disk Units for Start Compression display.
   Note: Compression can only be stopped if there is room in the ASP for moving data off of the disk unit. After the data has been moved off, the amount of data that is left on the disk is less than or equal to 92% of its uncompressed capacity.

                Select Disk Units for Stop Compression
    
   Select the units for stop compression.
    
   Type choice, press Enter.
     1=Stop compression
                   Serial                   Resource
   OPT Unit   ASP  Number     Type   Model  Name         Status
    1              68-7F0DB   6607    060   DD005        Non-configured
    
    
    
    
   F3=Exit     F12=Cancel

5. You are shown the Confirm Disk Units for Stop Compression display. This display shows the approximate amount of time that is required to stop disk compression, and the current and proposed sizes of the disk unit.

                Confirm Disk Units for Stop Compression
    
   Estimated time for this operation to complete : 1-2 Minutes
    
   Press Enter to confirm stop compression.
   Press F9=Capacity Information to display the resulting capacity.
   Press F12=Cancel to return to change your choice.
    
                      Serial                    Current     Proposed
   OPT  ASP   Unit    Number      Type   Model  Size        Size
    1                 68-7F0DB    6607    060   8388        4194
    
    
    
    
   F9=Resulting Capacity           F12=Cancel

6. At the Confirm Disk Units for Stop Compression display, press Enter to confirm your choice of disk units that you want to stop compression on. You are shown the Stop Compression on Disk Unit Status display.

                 Stop Compression on Disk Unit Status
    
   Estimated time for this operation to complete : 1-2 Minutes
    
   The operation to stop compression on the selected disk units
   will be done in multiple phases.  The phases are listed here
   and the status will be updated as the phase proceeds.
    
   Phase                                       Status
    
   Prepare to stop compression  . . . . . . :   0 % Complete
   Stop compression . . . . . . . . . . . . :
    
    
    

7. After the stop compression operation completes, you are returned to the Work with Disk Compression display, and shown a completion message.

                        Work with Disk Compression
    
   Select one of the following:
    
        1. Display disk compression status
        2. Start compression on disk units
        3. Stop compression on disk units
    
    
    
    
   Selection
    
   F3=Exit     F12=Cancel
    The requested compression operation completed successfully.