tmp_dsn_alloc_site_ps

By this option you can specify parameters used for allocation of temporary PS datasets. This is used when HOSXIN dataset is created. You can specify space and units (tr, cy).

'environment' => array (
    '*' => array (
        'temp_dsn_alloc_site_ps' => 'space=15,30 cy',
    )
)

For PO datasets use temp_dsn_alloc_site instead.