To all that responded to this thread, thank you. One of the good thinks about this field is you learn every day and when you stop learning, it's time to get out.
Again thanks, Bill -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Chase, John Sent: Friday, August 15, 2008 9:25 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: DASD Space Allocation > -----Original Message----- > From: IBM Mainframe Discussion List On Behalf Of William F Besnier > > I'm not explaining my concerns correctly. My concern is not > the number of extents used; it is the space allocated, the > JCL space parameter is asking for 2500,100 cylinders of space > for a total 4000 cylinders. What seems to have happened is > the first volume was allocated the primary + 3 extents for > 2800 cylinders; the second volume was allocated 16 extents of > 100 cylinders for 1600 cylinders - rlse, the total being 4331 > cylinders being allocated when only 4000 was requested. The > file/volume are non-SMS and my question is WHY ISN'T THE JCL > REQUEST BEING HONOURED? It is. Your JCL (apparently) specified to use (at least one) additional volume(s), so when space was no longer available on the first volume for a secondary extent, you then got "allowed to allocate" another 16 extents of 100 cyls each on the second volume, for a total of 1600 cyls ON THAT VOLUME. Thus, given your observation that you got one primary and three secondary extents on the first volume, for a total of 2800 cyls, and the dataset then extended to a second volume, you got "entitled" to an additional 1600 cyls on the second volume. Had you specified the maximum of 59 volumes, you would have been "entitled" to allocate a maximum of 1600*58 + whatever space you got on the first volume (2800, based on your posted observation) If you wanted to limit the available space to exactly 4000 cyls, you should have specified a primary of 4000 cyls with no secondary, on a volume that had 4000 cyls available. -jc- ---------------------------------------------------------------------- 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
