Joined: 14 Mar 2007 Posts: 8629 Location: Back in jolly old England
Instead of calculating how many tracks or cylinders to allocate a new dataset you can let SMS take care of the calculation. (Note: SMS must be installed on your mainframe).
Uh ??? The use of SMS to allocate space units is purely site specific. Most sites that I have set up only use this for a few datasets. If the space requirements change the JCL supplied values take priority over the DATACLAS specified values, so usually make the users / prod jobs specify space requirements in the JCL so that they are easily available in case of Sx37 abends. How would you know to which values to increase the space allocation when only DATACLAS is coded ?
SMS has many other uses, like determining how a dataset will be managed by the ILM product, which hardware should be used to store the data, what specific DASD pool to use, how many backup versions to maintain, what to do with backups when the dataset has been deleted, and many more too.