z/VSE 5.2: Virtual Disks in memory objects
Ingolf24 120000DRN3 Visits (2938)
Today I will describe another z/VSE 5.2 enhancement: Virtual Disks in memory objects.
Last November I described z/VSE's Virtual Disk support in a blog entry. Before z/VSE 5.2 Virtual Disks could be allocated in data spaces only with a size of up to 2 GB - the architectural limitation of data spaces.
With z/VSE 5.2 you can allocate a Virtual Disk in memory objects. Memory objects are chunks of virtual storage, allocated above 2 GB (in 64 bit virtual storage). With memory objects it is possible to define Virtual Disks (via the VDISK command) with a size of up to 4 GB.
The z/VSE system allocates Virtual Disks in data spaces or memory objects dependent on the availability of 64 bit virtual storage. With the SYSDEF MEMO
That is if there is enough 64 bit virtual storage available, the virtual Disk will be allocated in a memeory object. Otherwise it will be allocated in a data space.