Starting disk compression

You can start disk compression from the Dedicated Service Tools (DST) menu.

1. If your use your 2748 storage I/O controller for compression, make sure that you set the jumper for compression mode before you continue with the following steps.
2. If you are not already using DST, perform a manual initial program load (IPL) to start DST.
3. 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.
4. Select option 2 on the Work with Disk Compression.

                        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

5. Select the disk units that you want to start compression on from the Select Disk Units for Start Compression display.
   Note: You can only start compression on a configured unit if the disk unit is less than or equal to 92% full.

                Select Disk Units for Start Compression
    
   Select the units for start compression.
    
   Type choice, press Enter.
     1=Start compression
                   Serial                   Resource
   OPT Unit   ASP  Number     Type   Model  Name         Status
    1              68-7F0DB   6607    050   DD005        Non-configured
                   68-5FB0B   6713    050   DD001        Non-configured
    
    
    
    
   F3=Exit     F12=Cancel

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

                Confirm Disk Units for Start Compression
    
   Estimated time for this operation to complete : 14-16 Minutes
    
   Press Enter to confirm your choice to compress the disk units.
   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    050   4194        8388
    
    
    
    
   F9=Resulting Capacity           F12=Cancel

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

                 Start Compression on Disk Unit Status
    
   Estimated time for this operation to complete : 14-16 Minutes
    
   The operation to start 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 start compression . . . . . . :   0 % Complete
   Start compression  . . . . . . . . . . . :
   Prepare to compress data . . . . . . . . :
   Compress data  . . . . . . . . . . . . . :
    
    
    
    
   Wait for next display or press F16 for DST menu

8. After the start 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.