z/OS DFSMSdss Storage Administration
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Controlling the wait/retry time for serialization of system resources (PN11523)

z/OS DFSMSdss Storage Administration
SC23-6868-01

For system resources (such as the VTOC or VVDS), the default wait time is 3 seconds and the default retry count is 30. Therefore, the total default wait time is 90 seconds. To modify these defaults, you must set the byte at each of the following offsets:
X'0D'
An indicator that new wait/retry values are specified. Any nonzero value is valid.
X'0E'
The new wait time in seconds. Valid values are X'00' through X'FF' (0 - 255).
X'0F'
The new retry count. Valid values are X'00' through X'FF' (0 - 255).
To have DFSMSdss use a wait time of 60 seconds and a retry count of 10 (for a total wait time of ten minutes), do one of the following:
  • Use the SET PATCH command to set the wait/retry time dynamically
  • Modify the sample JCL (see Sample JCL) as follows:
    //SYSIN    DD *
       NAME ADRDSSU ADRPATCH
       VER    000D    000000      /* Verify all three bytes are zero */
       REP    000D    FF          /* Set indicator flag to nonzero   */
       REP    000E    3C          /* Set wait time to 60 seconds     */
       REP    000F    0A          /* Set retry count to 10           */

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