>Please assist. For a PS file with RECL of 260 the system determined block size >is 27820 (half-track). But that is for an uncompressed file. A compressed >file will get a 32760 block size. Would this be due to the system needing to >cater for the compression details? Can somebody explain the logic for me.
The data that is physically written to the disk is the compressed data, let's call it the physical block. The blocksize of that data will be half track size, or with zEDC full track size. However, what is read form or presented to the application is the logical block, before compression, or after decompression, resp., and this can now be the optimum size supported by the access method, mostly this is 32760. Have a look the physical data on the disk using DFDSS, and you will see the difference. -- Peter Hunkeler ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
