The IOA Conditions file consists of:

• 1 physical record for synchronization purposes
• 32 logical records for prerequisite conditions, consisting of:
  • 31 logical records; one for each day of the month
  • 1 logical record for STAT conditions

Each prerequisite condition requires 24 bytes. Therefore, the number of prerequisite conditions that can be stored for each day of a month is 1/24th of the value specified for the record size in the IOA Conditions file, which is 32 KB.

Due to MVS access method limitations, a maximum of 32 KB can be specified for the record size, subject to any disk block size limitation. This default allows a maximum of 1365 prerequisite conditions to be stored in each physical record of the IOA Conditions file.

The CNDREC# parameter, described in Parameters specifies the number of physical records in a logical record.

If your site uses a large number of prerequisite conditions, such as OUT conditions created by Control‑M, and you require more than the maximum 32 KB for each record in the IOA Conditions file, additional space can be provided by increasing the value of the CNDREC# parameter.

Use the following formula to calculate the region size needed for the IOA Conditions file:

32760 * ((32 * CNDREC#) + 2 + INT((CNDREC# - 1) / 255) )