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?
bILL -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Ron Hawkins Sent: Friday, August 15, 2008 12:50 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: DASD Space Allocation William, Assuming you do not have any software with Primary or Secondary extent reduction, or secondary extent increase rules. I'm talking pure dataset allocation without any allocation recovery. So, if the Primary was allocated in four extents, that means you can have an additional 12 extents on the 1st volume. That's 2500 CYLs + 1200 CYLs for a total 3700 CYLs. That means the second volume would have 7 secondary extents. That is 6 of 100 CYLS and one of 31 CYLS (which is what happens with RLSE in the JCL or MGMTCLAS). That's one extreme. You could have 3 secondary extents on the 1st volume (2800 CYLS) and 16 secondary extents on the 2nd volume (1531 CYLS), or some combination in between. I guess I'm not following what the problem is. Ron > > The initial allocation was in 4 extents. I thought for a PS file, the > F1 > DSCB gave 3 extent descriptors and the F3 DSCB gave another 13 extent > descriptor for a total of 16 extents per volume. Please explain how > 1831 > cylinders requires 19 extents and that is consistent. > ---------------------------------------------------------------------- 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
