Distribution libraries (DLIBs)

You should place data sets on the DLIB volumes wherever they fit. There need not be a correlation between TVOL1 and the DLIB volume for TVOL1, or between TVOL2 and the DLIB volume for TVOL2, and so forth. It is possible, but not necessary, to SMS-manage the data sets.

Keep in mind how other systems will use the distribution libraries when you are deciding where to place them. There might be cases where you do not want or need a set of distribution libraries available on certain packs. These cases include:

Distributing software to sites that do not use SMP/E or need the distribution libraries
Having multiple target zones connected to a DLIB zone.

When allocating the distribution libraries you might have to use more than one DLIB volume. For an estimate of how much space the distribution libraries in z/OS® will use, see the topic about "Total DASD Storage Requirements" in z/OS Program Directory at http://www-03.ibm.com/systems/z/os/zos/installation/.

If space allows, any of the following DLIB volumes can be combined with their corresponding target volumes: DLIB volume for licensed products, DLIB volume for vendor products, and DLIB volume for subsystems.

If you choose to catalog your distribution library data sets, you should catalog them in the user catalog used for the DLIB zone CSI. This makes it easier to move the DLIB volumes into other environments, to switch between different levels of DLIB volumes, and to have more than one level available at a time. It also reduces the amount of update activity required for the master catalog.