Do a QUERY SETSYS and verify that you ARCCMDnn is being processed as you expect.
Dave Gibney Information Technology Services Washington State University > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Vinson Lee > Sent: Friday, April 17, 2009 9:21 AM > To: [email protected] > Subject: Re: DFHSM MAXBACKUPTASKS(1) using 2 drives > > Unfortunately, we're still running z/OS 1.7, so IBM will not allow us > to open > a PMR for this issue. We are a small shop and do not have a lot of > tape > drives available and are trying to minimize the number of tape drives > in use > at a time. Two backup tasks are started even though we specify > MAXBACKUPTASKS(1) and DUPLEX BACKUP (N). The tasks are backing up > different > volumes and write concurrently to the drives. It looks like HSM is > defaulting to 2 tasks even though we are requesting only 1. > > According to the manual: > > Explanation: MAXBACKUPTASKS(nn) is an optional parameter specifying the > maximum number of volume backup tasks DFSMShsm can concurrently > process. For > nn, substitute a decimal number from 1 to 15 to represent the number of > volume backup tasks to be run concurrently. > > DFSMShsm Defaults: If you do not specify this parameter on any SETSYS > command, the DFSMShsm default is two tasks. > > Explanation: DUPLEX allows DFSMShsm to create two tapes concurrently, > the > original tape intended to be kept onsite and the alternate tape taken > offsite > or written to a remote tape library. > > BACKUP(Y|N) > Duplex alternates will or will not be made for backup volumes. If this > subparameter is not specified, no change will be made to the current > setting > for backup. Y specifies that duplexing will occur for backup tape > volumes. N > specifies that duplexing will not occur for backup tape volumes. > > DFSMShsm Defaults: If you do not specify DUPLEX and either of its > subparameters, DUPLEXING does not occur. > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf > Of O'Brien, David W. (NIH/CIT) [C] > Sent: Friday, April 17, 2009 1:58 AM > To: [email protected] > Subject: Re: DFHSM MAXBACKUPTASKS(1) using 2 drives > > > Robert, > > No, I don't think I'm confused. The OP wrote that 2 drives were > allocated for > 1 Backuptask. While I've done what you're suggesting to speed up batch > jobs, > I'm not sure how or why you would specify Unit=(TAPE,2) for a HSM > subtask. > Could you elaborate? > > I take it you are awash with spare tape drives. > > Dave O'Brien > NIH Contractor > ________________________________________ > From: IBM Mainframe Discussion List [[email protected]] On Behalf Of > Robert A. Rosenberg [[email protected]] > Sent: Thursday, April 16, 2009 11:35 PM > To: [email protected] > Subject: Re: DFHSM MAXBACKUPTASKS(1) using 2 drives > > At 15:49 -0400 on 04/16/2009, O'Brien, David W. (NIH/CIT) [C] wrote > about Re: > DFHSM MAXBACKUPTASKS(1) using 2 drives: > > >Er Jay, We're talking about tape drives here. > > > >1 Backup Task should have 1 DASD unit as input and 1 Tape unit as > >output. > > > >The OP specified Duplexing was turned off. > > > >Dave O'Brien > >NIH Contractor > > I think there is some confusion. > > MAXBACKUPTASKS(1) means start 1 task. > > DUPLEX BACKUP(N) means create only 1 Backup Dataset (ie: One DD). > DUPLEX > BACKUP(Y) would mean to allocate 2 DDs (and thus 2 backup > datasets) and write each record to both DDs. > > The two tape drives allocated is probably due to UNIT=(TAPE,2) being > used for > the allocate (ie: Allocate 2 drives and switch to the 2nd drive/tape at > EOV > on the first tape to save time when you rewind/unmount it and need a > second > tape mounted to continue to backup file create [the 2nd tape is already > mounted/ready]). > > ---------------------------------------------------------------------- > 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 > > ---------------------------------------------------------------------- > 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 > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
