Gilbert, Your assumption in question 1 is incorrect. Use of Reuse does not preclude use of Duplexing.
Thank You, Dave O'Brien NIH Contractor ________________________________________ From: IBM Mainframe Discussion List [ibm-m...@bama.ua.edu] On Behalf Of Gilbert Cardenas [gilbertcarde...@grocerybiz.com] Sent: Tuesday, August 11, 2009 8:29 AM To: IBM-MAIN@bama.ua.edu Subject: HSM duplexing for ML2 Tapes Hello all, we are on z/OS 1.9 using CA/TLMS and I want to turn on ML2 duplexing to reduce the amount of time and effort needed to recover an ML2 volume (not really for offsite backups). I have read most of the HSM duplex posts and the manuals to try to formulate how this function works and from what I've read, if I want to turn on HSM duplexing for existing ML2 tapes (not backups), it's as easy as adding SETSYS DUPLEX(MIGRATION(Y)) to the ARCCMD00 parmlib member. The part that I (and apparently others) were confused about is the partialtape setting. Question 1 (Is this correct?) If you specify MIGRATION(REUSE) an ML2 tape is not selected for duplexing. If you want an ML2 to be duplexed, you need to either specify SETSYS PARTIALTAPE(MIGRATION(MARKFULL)) or generate a list of partialtapes LIST TTOC SELECT(ML2 NOTFULL) ODS(OUTPUT.DATASET) and mark them full so that TAPECOPY will automatically duplex them. Question 2 (Is this also correct?) If the above is correct, then by marking an ML2 volume full before it is actually full will probably triple the number of scratch tapes required. An extra tape for each duplex copy and since all of a tape will not be used, more tapes will be needed. Can someone please help clarify this area for me. Many thanks, Gil. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
