On 18 Feb 2012 17:53:19 -0800, in bit.listserv.ibm-main you wrote: >At 16:11 -0600 on 02/13/2012, Joel C. Ewing wrote about Re: Archaic >allocation in JCL (Was: Physical record size qu: > >>The "gotcha" used to be that if you grossly over-requested space, >>got space dispersed over umpteen volumes, only used a little of the >>space, that "RLSE" would then only release the unused space on the >>last volume actually written and leave all the unneeded, unused >>space on subsequent volumes allocated until the data set was deleted. > >This could be fixed by defining a RLSEALL parm (which would not only >release the unused space on the last used volume but also release all >the extra volumes). This could be in the JCL or better SMS (since SMS >is doing the allocation in the first place). I regard this failure as >a Design Flaw AKA Bug. > >Query - If I have a multi-volume existent dataset that I allocate as >DISP=OLD and open as output (thus rewriting from the start) which has >SPACE coded as RLSE does it release the space on volumes past the one >that was used or also just the unused extents on the last written >volume?
For VSAM I would still allocate in either tracks or cylinders so that I get the CA size I want. Of course if allocation is in millions of anything, that caveat doesn't matter (or have they changed VSAM so a CA can be larger than a cylinder?). Clark Morris ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
