On 11/06/2012 05:13 AM, Paul Gilmartin wrote:
On Tue, 6 Nov 2012 01:05:50 -0500, Sam Golob wrote:Further, if, when you copied an SL tape to NL with COPYMODS using PARM=STRIP, and you also dumped the images of all the labels using PARM=LABLDUMP at the same time, you can then RECONVERT the NL tape back to an SL tape, by sandwiching the dumped labels back, using the PARM=LABADDIN option of COPYMODS. So you can go SL to NL, and then NL to SL for an entire tape, with many files. Further, if you want to change some of the labels in the meanwhile, you can edit the dumped labels before splicing them back on the NL tape using a PARM or SYSIN of LABADDIN under COPYMODS. Cool?Will this round-trip conversion work correctly even if the original SL tape contained several empty data sets? Does COPYMODS support changing the VOLSER in both the VOL1 and HDR1 labels? -- gil
"Empty" tape data sets shouldn't pose any special problems, as they are not empty in the NULL sense but still contain an EOF "tape mark" on the tape after the optional physical data blocks and can be represented unambiguously by just an EOF mark on either NL or SL tapes. The only difference is that a SL tape contains two additional physical files for each logical file, each also terminated by a tape EOF -- header labels in front and trailer labels behind the physical data file. As long as you have some way to supply the data set descriptive info needed for the label records, going from NL to SL isn't made any more difficult by an empty file. Having actual data may make it possible to verify that "known" data set attributes are consistent, but would in general be inadequate for unambiguously determining the correct data set attributes if they are unknown. -- Joel C. Ewing, Bentonville, AR [email protected] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
