System allocation of disks

Each disk allocation is stored in its standard volume label (SVL). For this purpose the SVL of the disk contains a system allocation log into which up to 16 catalog IDs of systems reserving the disk can be entered in the case of public disks. The types of allocation for disks are as follows:

System-exclusive allocation

A disk can be reserved by one system only. The system ID of the home pubset of this system is entered in the system allocation log of the SVL to prevent simultaneous use of the disk by other systems.

System-shareable allocation:

A disk of a shared pubset can be reserved by up to 16 systems simultaneously. The system ID of each system reserving the disk is entered in the system allocation log so that a maximum of 15 further systems can simultaneously reserve the disk.

When the software product MSCF is used, the information in section “Shared pubsets” must be observed.