Directory Manager Guide › Managing Minidisks › Changing Minidisks › Redefining a Minidisk in Place

Redefining a Minidisk in Place

You may sometimes need to increase the size of a minidisk, but you do not have enough contiguous disk space available to hold the new minidisk. If you have enough space next to the existing minidisk, you can expand the minidisk by redefining it in place.

For example, you have a 100-cylinder minidisk, occupying cylinders 320 to 419, which you need to expand to 110 cylinders:

You do not have 110 contiguous cylinders available in which to redefine this minidisk; however, you do have 20 free cylinders adjacent to the existing minidisk, at 300 to 319:

You can redefine this minidisk in place, expanding it to occupy any 110-cylinder space within the cylinders numbered 300 to 419, for example, cylinders 300 to 409 or 310 to 419:

Redefining a minidisk in place also means you do not have to re‑enter directory links for it, as you would if you delete it and redefine it with more space. However, you do require write access to the minidisk you want to move in place.

Important! Redefining a minidisk in place reformats and destroys all files on the minidisk. You must therefore preserve the data on this minidisk if it will be needed in the future.

To redefine a minidisk in place

1. From CMS, enter the MANAGE command with the name of the directory entry that owns the disk, the numeral 9, and the disk virtual address. For example, to redefine the ACCTING 16D disk, enter the following:

   vmdirect manage accting 9 16D
   

   The Redefine a Minidisk in Place screen appears.

    MAN000A0              Redefine a Minidisk in Place                 VM:Director   
    ------------------------------------------------------------------------------ 
                                                                                   
     Userid: USERID     Minidisk Address: 192               Device Type: 3390      
     Volume: VST020    Minidisk Location: 1303            Minidisk Size: 1         
      Label: DSK192          Utilization: 04            Number of Files: 0         
                                                                                   
                                                                                   
          + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +        
          |                      New Minidisk                             |        
          |                                                               |        
          |   Subpool: MAIN       Start: 1303          Size:              |        
          |                                                               |        
          |   Do you want to wait while formatting?    YES                |        
          + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +        
                                                                                   
              Warning: New and old minidisks will be formatted                     
                       and all files will be destroyed.                            
                                                                                   
                                                                                   
   --------------------------------------------------------------------------------
    PA1: Cancel      PF1: Help        PF3: Quit        PF10: Print       PF12: End 
   

2. The Subpool field initially lists your default subpool, meaning that CA VM:Director will allocate the minidisk you are redefining according to your default subpool’s definition.

   To redefine the minidisk according to the definition of another subpool you are authorized to use, type that subpool name.

3. The Start field shows the current starting location of the minidisk on the real disk; this is either the cylinder number (if the minidisk is on a CKD device) or the block number (if the minidisk is on an FBA device). To keep the minidisk starting at its current location on the real disk, do not change this value.

   To define the minidisk to a different location on the real disk, type that location in this field.

4. To change the size of the minidisk, specify the new size in the Size field.

   If the minidisk is a CKD device, this size is the number of cylinders the minidisk will contain; if the minidisk is an FBA device, the size is the number of 512–byte blocks it will contain. The smallest allowable size is 12 blocks.

5. Press ENTER to submit your changes to CA VM:Director and return to the Manager Selection Menu.