The BIGSIZE record defines the threshold size for large minidisks. The default is the 95th percentile.

If the BIGSIZE value is smaller than that specified for medium-size minidisks (MEDSIZE), VMRMUA reverts to the default for BIGSIZE. Furthermore, if BIGSIZE is less than 50 percent larger than MEDSIZE, VMRMUA reverts to the default values for both of these records.

The BIGSIZE record acts with the BIGUPD and BIGUTIL records to specify selection criteria for large minidisks. The record has the following syntax:

BIGSIZE ["Parms"]

Parms:
  95percentilennnnKnnMblknum FB-512cylnum devtype
  • percentile
    Specifies the large-size minidisk threshold by a percentile ranking. The value for percentile must be an integer between 80 and 99. VMRMUA compares the sizes of all minidisks and identifies large minidisks as those that are as large as or larger than percentile percent of all minidisks.
  • nnnnK
    Specifies the large-size minidisk threshold in kilobytes. This is expressed as nnnnK, where nnnn specifies that large minidisks are those that occupy nnnn kilobytes or more.
  • nnM
    Specifies the large-size minidisk threshold in megabytes. This parameter is expressed as nnM, where nn specifies that large minidisks are those that occupy nn megabytes or more.
  • blknum FB-512
    Specifies the large-size minidisk threshold in FB-512 blocks. This parameter is expressed as nnnnn FB-512, where nnnnn specifies that large minidisks are those that occupy nnnnn FB-512 blocks or more.
  • cylnum devtype
    Specifies the large-size minidisk threshold in cylinders on a CKD-type DASD volume. This parameter is expressed as mm nnnn, where mm specifies that large minidisks are those that occupy mm cylinders or more and nnnn specifies the actual CKD device type, such as 3380.
    Note: The actual size of large minidisks selected by this parameter is calculated using 1024 byte blocks.

Examples

  • To define a large minidisk as one in the 90th percentile, change the BIGSIZE record to:
    BIGSIZE 90
    
  • To define a large minidisk as one that occupies 600 kilobytes or more, change the BIGSIZE record to:
    BIGSIZE 600K
    
  • To define a large minidisk as one that occupies eight megabytes or more, change the BIGSIZE record to:
    BIGSIZE 8M
    
  • To define a large minidisk as one that occupies 16,000 FB-512 blocks or more on an FBA-type DASD volume, change the BIGSIZE record to:
    BIGSIZE 16000 FB-512
    
  • To define a large minidisk as one that occupies 27 cylinders or more on a 3380-type DASD volume, add the BIGSIZE record:
    BIGSIZE 27 3380