# Setup of LTA Disk Files

This section describes how to define and initialize LTA disk files.

## Definition of LTA Disk Files

JCL is available for defining a default set of Substation ES log and trace files. The following table lists the recommended values.

Default Values of LTA Disk Files
IDCAMS Parameter | Log File Values | Trace File Values | Notes
--- | --- | --- | ---
NUMBERED1 | Yes | Yes | You must specify a value for the NUMBERED parameter because it designates that the file is a Relative Record data set.
REUSE | Yes | Yes |
SHR | (2,3) | (2,3) |
RECSZ2 | (2400,2400) | (9200,9200) | Because the entries recorded in the LTA disk files are of fixed length, the average size and the maximum record size of the RECSZ parameter must be equal. The minimum value to be specified for the average record size is 1048 bytes.
RECORDS3 | (4000) | (3000) | You can change the value of the RECORDS parameter to suit your site’s environment. The installation default creates two files each for the Log and Trace Agents.

Space usage for the default Log and Trace files is based on a 3390 model 3 drive, in which the Log allocates 13 cylinders and the Trace File allocates 34 cylinders of disk storage.
Note: If you do not set the WRAP parameter to on, be careful of changing the number of records to be less than the default value. If you set the number of records too low, many entries are recorded and files become full very quickly.

## Initialization of LTA Disk Files

Before Substation ES can use the newly defined LTA disk files, you must format them with the Substation ES LTA Services Utility, which formats one file per execution. This format routine of the utility creates control and summary information for internal use on the first record of each file. Additionally, the utility formats each record within the file with specific header information.

Sample JCL in the `SXGLINIT` member is available for initializing the default Log and Trace disk data sets of Substation ES.

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