Ted, It's far less complex than that. A little bit of analysis and you can easily come up with 3-5 size categories that datasets can be placed into, and then just stick with those size buckets.
I had a site many years ago that simply wanted to have a symbolic in the JCL that asked for small, medium, large and huge and I implemented this with a DATACLAS for each of the four symbolic using a different Primary, Secondary and UNITCNT value for each one. Combined with ACC/SRS as insurance when they got it wrong this worked like a dream. However I did end up using different specifications for VSAM and PS because of the different extent support. The very kewl thing about this was they could run the same JCL in all the Development, Volume Test and Production environments, and I used DATACLAS to change the relative size of the datasets in each environment. Once setup it was rarely modified, and by using Space Recovery software (ACC/SRS, STOP-X37, etc) it was almost maintenance free. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Ted MacNEIL > Sent: Tuesday, September 02, 2008 3:05 PM > To: [email protected] > Subject: Re: [IBM-MAIN] Discussion on Mod 27 usage > > >Interesting. Of course, the code in the Data class routine might get > pretty complicated if you only want to fiddle with the space requested > on particular storage groups, since DATACLAS is the first routine > processed. > > > And, I realised (upon reflection) that the routine would have to be > changed every time you added a volume to the storage group. > > Also, since DATACLAS is the first routine, would you even know the > target Storage Group; how would you know to change the allocation? > > - > Too busy driving to stop for gas! > > ---------------------------------------------------------------------- > 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
