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IOA Access Method files can contain multiple extents. Each extent is a separate sequential file that contains a maximum of 65535 blocks and is allocated without a secondary space allocation.
If an IOA Access Method file has more than 65535 blocks, specify a space parameter, by an expression such as SPACE=(65535,30000). In this case, the IOA Access Method allocates a first extent of 65535 blocks and a second extent of 30000 blocks as separate OS/2390 or z/OS sequential files. However, the IOA Access Method treats the two files as one file with two extents. The new extent is allocated when records are written to the file if the first extent does not have sufficient free space for the new records.
The maximum size for secondary extents is also 65535 blocks. The IOA Access Method supports a maximum of 256 extents.
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