434 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
IBM Storwize V7000 allocates provisioning_group_id, which is the identifier for the 
provisioning group that is affiliated with the MDisk. A provisioning group is an object that 
represents a set of managed disks that share physical resources. This is represented 
differently depending on the back-end storage, as shown in the following examples:
– A9000: The entire subsystem forms one provisioning group.
– Storwize V7000: The storage pool forms a provisioning group, which allows more than 
one independent provisioning group in a system.
– RAID with compressing drives: An array is a provisioning group that presents the 
physical storage that is in use much like an external array.
The physical_capacity and physical_free_capacity parameters belong to the MDisk’s 
provisioning group. They indicate the total physical storage capacity and formatted 
available physical space in the provisioning group that contains this MDisk.
Note: It is not recommended to create multiple storage pools out of a MDisks in a single 
provisioning group.