System Parameters

Description

Controls segment size in multi-segmented files. 'MB' must be set to a value to activate the multi-segmented file feature.

PxPlus uses the value set in the 'MB' parameter as a target size for each segment. If, for example, you wanted all files to be around 1 GB, you would set the 'MB' parameter to 1024 representing 1024 megabytes or 1 GB.

The actual size of each segment will be determined based on the block size of the file. Internally files are partitioned into logical 'units' where each unit represents a portion of the file whose free space is managed by a single block (an inventory block). The Unit size can be computed as follows:

Unit size = ((bksz - 6) * bksz) 

The value bksz above represents the block size of the file -- normally between 1 and 8 kilobytes. You can use the BSZ= option when you create the file to override the default block size for a file.

As a unit is filled, the system will check to see if the file exceeds the 'MB' setting. If so, the next unit of the file will be placed in a new segment.

The following table lists the maximum number of segments allowed for a file based on valid block sizes (1 to 31 kilobytes):

Note:
This feature is available for variable length records (VLR) format only.

Default

'MB'=0

See Also

EFF vs. VLR File Formats