Have you considered using extended format sequential striped data sets? Define using a data class with DSNTYPE set to require or request extended format; control the number of stripes (which are read in parallel) using a storage class with a non-zero sustained data rate attribute. Choosing the value of the sustained data rate is a little clumsy but, in brief, 8 gives two stripes and 12 gives 3 stripes for 3390 device geometry.
Last time I looked, the throughput scaled roughly linearly with the number of stripes. Regards, Nigel Morton ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
