Sridar, A correction to my post. The data rate is only used by striped datasets.
If you use a STORCLAS with guaranteed space=YES and nothing else then you will get the primary allocation you request on each volume you requested, or on the number of non-specific volumes you request in the UNIT parm. The volumes must be SMS managed. With Guarenteed Space you must change the unit count from 20 to 2, or you will get that primary space allocated on 20 volumes (or perhaps the two volumes in the VOL=SER override the UNITCNT). Ron > -----Original Message----- > From: Ron Hawkins [mailto:[email protected]] > Sent: Friday, October 15, 2010 10:58 AM > To: 'IBM Mainframe Discussion List' > Subject: RE: [IBM-MAIN] Space allocation question... > > Sridar, > > This will work if you also use a Guarenteed Space Storage Class. The size of > the primary allocation on each volume will depend on how the MB/sec rate has > been specified in the Storage Class. It's an old technique that many people > used to use for SAS before they got their multi-volume support figured out. > > For VSAM the first allocation on the second volume would normally be equal to > the primary space you have specified if the file is overflowing as you fill > it. However this can changed with the Data Class so that you only get the > secondary allocation as you overflow onto subsequent volumes. > > Ron > > > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf > Of > > Veena, Sridhar > > Sent: Friday, October 15, 2010 10:23 AM > > To: [email protected] > > Subject: [IBM-MAIN] Space allocation question... > > > > Hi, > > > > > > > > I am trying to allocate dataset with 6672 cylinders of space across two > > volumes as a primary extent. I am told that the allocation should look > > as shown below... > > > > > > > > //DD1 DD DSN=TEST.DATASET, > > > > // DISP=(,KEEP), > > > > // SPACE=(CYL,(3336,20)), > > > > // VOL=SER=(VOlUME1,VOLUME2) > > > > > > > > I tried above allocation but I am getting just 3336 cylinders as initial > > allocation. What could be wrong here? Should the volumes be non-SMS? If > > they are SMS does it need some SMS rule to allocate primary space > > specified across each of the volumes?! Please help. > > > > > > > > Sridhar > > > > > > > > > > ---------------------------------------------------------------------- > > 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
