CHANGE SPACE

Purpose

You can use the CHANGE SPACE command to change the following values for data sets:

Amount of primary space
Amount of secondary space
Number of directory blocks needed (only for partitioned data sets).

Syntax


CHANGE SPACE

>>-+-CHANGE-+--+-SPACE-+--+-primary-+--------------------------->
   '-CH-----'  +-SP----+  '-*-------'   
               '-S-----'                

>--+------------------------------+----------------------------><
   '-+-secondary-+--+-----------+-'   
     '-*---------'  '-dirblocks-'

Parameters

primary

Specifies the percentage by which to increase or decrease the current primary space value. The following values are valid:

To increase the space, specify an integer from +1 through +100 (the prefixed plus sign is optional).
To decrease the space, specify an integer from -1 through -50 (the prefixed minus sign is required).
To leave the primary space unchanged while changing other space values, specify an asterisk (*).

secondary

Specifies the percentage by which to increase or decrease the current secondary space value, or specifies a fixed percentage of primary space on which to base the amount of secondary space. The following values are valid:

To increase the space, specify an integer from +1 through +100 (the prefixed plus sign is optional).
To decrease the space, specify an integer from -1 through -50 (the prefixed minus sign is required).
To define the amount of secondary space as a percentage of primary space, specify an integer from P0 through P100 (the prefixed P is required). This amount is based on the current primary space value and will not be recalculated if the primary space is later changed.
To set secondary space to zero, specify P0.
To leave the secondary space unchanged while changing other space values, specify an asterisk (*).

IBM recommends increasing the primary space allocation when you use P0.

dirblocks

Specifies the percentage by which to increase or decrease the current number of directory blocks. The following values are valid:

To increase the space, specify an integer from +1 through +100 (the prefixed plus sign is optional).
To decrease the space, specify an integer from -1 through -50 (the prefixed minus sign is required).

Restrictions

For IBM-supplied data sets, you cannot decrease the primary space allocation to less than the original, shipped amount. If you attempt to do so, the dialog uses the shipped amount instead.
For user-defined data sets, you cannot decrease the primary space allocation to less than it was when you first defined it. You can increase the amount, but you cannot reduce it unless you delete the data set and redefine it with a smaller space allocation.
If the shipped secondary space allocation for a data set is zero, it means that secondary space is not allowed for the data set. This allocation must remain at zero.
You cannot decrease the number of directory blocks for a data set to a value that is less than its original, shipped value. If you attempt to do so, the dialog uses the shipped value instead.

Examples

To increase primary space 25 percent, enter:

CH S  25        (or CH S  +25 )

To increase the secondary space by 20 percent, enter:

CH S  * 20      (or CH S  * +20)

To remove the secondary space altogether (for example, for link list eligible data sets), enter the following command:

CH S * P0

Assume that for all data sets in the current display list, you want to increase the number of directory blocks by 40 percent. Enter the following command:

CH S * * 40

Assume that for all data sets in the current display list, you want to increase the primary space by 20 percent and the secondary space by 50 percent. Enter the following command:

CH S  20 50      (or CH S  +20 +50)

Assume that for all data sets in the current display list, you want to decrease the primary space by 10 percent and increase the secondary space by 25 percent. Enter the following command:

CH SPACE  -10 25     (or CH S  -10 +25)

Assume that for all data sets in the current display list, you want to decrease the primary space by 15 percent and set the secondary space to 40 percent of the primary space amount. Enter the following command:

CH SP -15 P40

Assume that for all data sets in the current display list, you want to set the secondary space to 30 percent of the primary space amount. Enter the following command:

CH S * P30