Why do you need a z/VSE page data set ?
Ingolf24 120000DRN3 Visits (4191)
Some z/VSE releases ago a page data set (PDS) was always required to map virtual storage. The PDS size is mainly dependent on VSIZE and VIO as defined in the IPL Supervisor Parameters Command. Growing workloads require more virtual storage, that is larger page data sets. On ECKD the initialization of large PDSes may take a relatively long time. You can avoid that, if you allocate the page data set on FBA (e.g. minidisks on z/VM) or FBA-SCSI disks, because they do not need to be formatted.
Since some time we have the NOPDS option. With the NOPDS option you can run z/VSE without a page data set, if your processor storage can cover the required virtual storage size (VSIZE + VIO). That is there will be no page I/O to the PDS, and you can avoid double paging in z/VM environments (paging by z/VSE and z/VM), Your workload may perform better. NOPDS can be specified in the Supervisor Parameters Command.
If your System z configuration allows, I would run with the NOPDS option. If your z/VM system can handle the storage size of the z/VSE guest, I would also run without the page dataset.
The Supervisor Parameters Command is described in the z/VSE System Control Statements. PDS considerations are discussed in the z/VSE Planning book. Both books are on our z/VS