Still a little confused. What are you trying to do? If all you want to do is read a file, then just do it. Under z/os, the device type is of no particular interest to the application program. Z/os tracks the device type for you and uses appropriate I/O routines automatically.
That is, a given file can exist on any flavor of tape, virtual tape, DASD, or whatever. The application program need only specify the file (dataset) name in the JCL or in the dynamic allocation interface. Assuming the file layout is the same, then the application program can read from all of those devices and remain completely unaware and uncaring. If you want to create a file, then just specify the device type you want to use for this specific instance in your JCL. Again, z/os handles all the details for you. Consider that 'tape' actually covers a very large number of possible device types, each with peculiar requirements. Some 'tape' units may actually be DASD under the covers. But, again, typically this is of no concern. HTH -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Lindy Mayfield Sent: Tuesday, July 08, 2008 5:31 PM To: [email protected] Subject: Re: STARTIO macro doc I want to do like Flex and Hercules do where the tape is really a file on DASD. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Hal Merritt Sent: 9. heinäkuuta 2008 1:21 To: [email protected] Subject: Re: STARTIO macro doc Consider device redirection using SMS. That is, when an application calls for tape it is transparently redirected to DASD. AFAIK, 'virtual tape' is still physical tape. It is just a way to put many logical tape volumes on one physical tape volume in a way that is transparent to the application. Or am I not understanding what you want to do? -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Lindy Mayfield Sent: Tuesday, July 08, 2008 5:13 PM To: [email protected] Subject: STARTIO macro doc Does anyone have (or know a link to) any documentation on STARTIO? Google gave up a hint that there was a SHARE presentation on it, but no links that I could find. I'm still thinking how one might create a virtual tape on DASD device on z/OS. Maybe STARTIO is the way to do it. Thanks, Lindy NOTICE: This electronic mail message and any files transmitted with it are intended exclusively for the individual or entity to which it is addressed. The message, together with any attachment, may contain confidential and/or privileged information. Any unauthorized review, use, printing, saving, copying, disclosure or distribution is strictly prohibited. If you have received this message in error, please immediately advise the sender by reply email and delete all copies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
