If memory serves, the CA1 TMC uses 16 bits to store the blksize. Even when treated as unsigned, it won't show more than 65535.
On z/OS 1.11 system, the DFDSS default for DUMP tape blocks is 65520. I doubt if it was reduced for 1.12. There is an installation options exit which can change the default to 32760. If your system is actually writing 16K blocks, then something at your site (such as the DCB parameter on the DD statement) is causing that. On the other hand, the HSM Storage Administration manual mentions 16K blocks for ML2 tapes so it might not be DFDSS. :>: -----Original Message----- :>: From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On :>: Behalf Of Houzet Alain :>: Sent: Thursday, February 07, 2013 2:26 AM :>: To: IBM-MAIN@LISTSERV.UA.EDU :>: Subject: blksize for ML2 migrated dataset via HSM :>: :>: Hello, :>: I observed a blksize of 16k for all ml2 migrated dataset (seen on the :>: CA1 product). I use DSS as datamover and :>: i'm wondering about the size concerning the blksize. Why dss don't use :>: 256k since zos 1.12 ? :>: Everybody will have an answer. thank's ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
