Kees, Actually I think there is a little bit more intelligence to non-SMS allocation - not that that makes it smart. My somewhat faulty memory recalls that EDL for non-SMS is sorted in least used LCU, and then the volume with the least number of allocated datasets. I never got to the bottom of how often these counters are updated.
I think there is some intelligence added in the ESA era to mitigate circumstances where one job allocates all new files on the same volume. I think this was at the request of the DF/SORT developers. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Vernooy, C.P. - SPLXM > Sent: Thursday, 15 June 2006 3:36 PM > To: [email protected] > Subject: Re: z/OS 1.6 DASD Allocation using Esoterics > > Raymond, > > I wonder why you expect the level of intelligence that you miss... > This is old, pre-SMS, standard work dataset allocation, where each > allocation is handled separately, with no respect or intelligence for > the other 7 jobs, that you consider to have some relationship. > Allocating this kind of datasets uses hardly any rules that I recall, > requested space availability of course and maybe channel utilization is > taken into consideration, but AFAIK it is mainly random. SMS introduced > the intelligence that you are looking for. > For that matter, the division of the datasets over the volumes as a > result of submitting the jobs is different orders and speeds, is in my > opinion also purely random. > > Kees. > ---------------------------------------------------------------------- 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
