Thanks for response. I have read the stack topic, you suggested in previous emails. Now my understanding is.
As we are saving the dumps for only 16 days and most three dump volumes in use at any point of time. So, whenever our DUMP cycle execute on every wednesday at (0300 to 0400), it will ask for scratch tape volume for dumping the first MIGL00 volume and then use same tape volume to dump second MIGL01 volume. Now when next DUMP cycle execute on next wednesday at (0300 to 0400), it will again ask for scratch tape becuase Never contains more than one dump copy of the same source volume. DFSMShsm selects empty dump volumes as targets for auto or command dump. So, this is how HSM works. but as I have mentioned in prevoius email that we are migrating from ATL3494 to TS3400 tape library which has only 17 I/O slots for data cartridge, we should always have one tape volume in scratch status to perform this dumps in weekly basics. Please correct, if my understanding is wrong On Fri, May 24, 2013 at 1:22 PM, retired mainframer < [email protected]> wrote: > :>: -----Original Message----- > :>: From: IBM Mainframe Discussion List [mailto:[email protected]] > On > :>: Behalf Of Jake anderson > :>: Sent: Thursday, May 23, 2013 10:28 PM > :>: To: [email protected] > :>: Subject: Re: HSM option > :>: > :>: Hello, > :>: > :>: 1) HSM request for scratch tape, when performing a full volume dump of > :>: the > :>: volumes > :>: associated with some dump class. We have setup like below > > These are obviously not the actual control cards in your ARCCMDxx member so > we really cannot tell how accurate they are. You should use cut and paste > instead of retyping. > > :>: ADDVOL MIGL00 > :>: UNIT(3390) > :>: MIGRATION > :>: (MIGRATIONLEVEL1 > :>: AUTODUMP(MIGDMP) > :>: NOSMALLDATASETPACKING) > :>: THRESHOLD(85) > :>: ADDVOL MIGL01 > :>: UNIT(3390) > :>: MIGRATION > :>: (MIGRATIONLEVEL1 > :>: AUTODUMP(MIGDMP) > :>: NOSMALLDATASETPACKING) > :>: THRESHOLD(85) > :>: > :>: > :>: As per above code, we have two migration volumes (MIGL00 and MIGL01) > :>: defined under MIGDMP dump class. > :>: > :>: > :>: 2) There are only two DASD volume associated with this dump class. > :>: > :>: 3) In my previous email, I have wrongly put the dump time 0500 to 0600. > :>: It > :>: is actually dumping MIGL00 and MIGL01 volume on every Wednesday between > :>: 0300 to 0400. > :>: > :>: > :>: In our case, when every Wednesday dump starts at 0300, it ask for > :>: scratch > :>: tape volume, but I actually want dump of MIGL00 and MIGL01 volumes > :>: going > :>: into the used tape rather then scratch tape. > > The HSM volume dump function will not do this. Go back and read the quotes > from the manual I included in my previous message (and left again for you > at > the end of this one). Then go and read the full description in the manual. > > > :>: > :>: I want to do this because, we are planning to migrate from ATL3494 to > :>: TS3400 tape library, which has very minimum number of I/O slots where > we > :>: can keep data cartridge as compare to ATL 3494. > :>: > :>: if HSM ask for scratch tape volume everytime , then I will shortly run > :>: of > :>: the tapes and dump will fail. So, I want HSM to use the tape volume > :>: which > :>: has valid data and fill it to maximum before it > :>: ask for new scratch tape. > > HSM will never place a second dump of a DASD volume on the same tape volume > that already holds a previous dump of that DASD volume. > > However, since you save the dumps for only 16 days, at any point in time > you > will only have at most three dump volumes in use. On the fourth weekly > execution, the tape from the first will already be scratched and you can > reuse it. > > :>: On Thu, May 23, 2013 at 11:36 PM, retired mainframer < > :>: [email protected]> wrote: > :>: > <snip> > :>: > If you look at the description of the STACK operand in the HSM > Storage > :>: > Administration manual (Chapter 36 in my 1.11 copy), you will find: > :>: > > :>: > "DFSMShsm selects empty dump volumes as targets for auto or command > :>: dump." > :>: > > :>: > and > :>: > > :>: > "A given dump volume: > :>: > ... > :>: > Never contains more than one dump copy of the same source > volume. > :>: > ..." > > ---------------------------------------------------------------------- > 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
