I am guessing that you used a QSAM access method and it does all that for you under the covers. BSAM would also build a data chained CCW string under the covers for you, but I think you would have mentioned some of the other things you have to do if you were using BSAM.
Chris Blaicher Principal Software Engineer, Software Development Syncsort Incorporated 50 Tice Boulevard, Woodcliff Lake, NJ 07677 P: 201-930-8260 | M: 512-627-3803 E: [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Skip Robinson Sent: Monday, December 09, 2013 2:57 PM To: [email protected] Subject: Re: "hexadecimal"? Not sure what's meant by having to chain CCWs. I just finished updating an old RYO program that writes 80 byte records to any device specified because I needed to test >32K blocks on tape. I merely added a DCBE with BLKSIZE=0 and pointed to it in the existing DCB. No other changes. Created a tape file with BLKSIZE=261760 (256K) (as reported by RMM) by specifying that block size in JCL. No attempt at chaining, which I would not know how to do anyway. . . JO.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 626-302-7535 Office 323-715-0595 Mobile [email protected] From: "Blaicher, Christopher Y." <[email protected]> To: [email protected], Date: 12/09/2013 10:31 AM Subject: Re: "hexadecimal"? Sent by: IBM Mainframe Discussion List <[email protected]> Tape devices for BLKSIZE greater than 64K-1. You have to chain a number of CCW's together for a BLKSIZE=256K. Chris Blaicher Principal Software Engineer, Software Development Syncsort Incorporated 50 Tice Boulevard, Woodcliff Lake, NJ 07677 P: 201-930-8260 | M: 512-627-3803 E: [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Gerhard Postpischil Sent: Monday, December 09, 2013 12:54 PM To: [email protected] Subject: Re: "hexadecimal"? On 12/9/2013 11:53 AM, Scott Ford wrote: > Bill, > I thought you could chain ccws I think you misread his message, which started with command chaining. But I would be interested in which control units and controllers allow data chaining beyond 65KiB. Gerhard Postpischil Bradford, Vermont ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
