Whereas the formatting attributes of a volume set, which are defined at initialization, remain unchanged for as long as it exists, the availability and performance attributes can be changed in the ongoing operation. Only the performance attributes are dealt with below.
SM pubsets from the point of view of the user
So called storage services can be requested for a file using /CREATE-FILE or /MODIFY-FILE-ATTRIBUTES (STORAGE-CLASS operand) or the FILE macro (STOCLAS operand), i.e., the file attributes which are relevant for the storage location:
Operand | Meaning |
| Assigns the default storage class from the user catalog of the SM |
| Assigns a specific storage class. |
| There is no explicit assignment of a storage class. The user defines the performance attributes |
The user can obtain information on the names and attributes of the available storage classes (i.e. access must be permitted when GUARDS protection is set) with /SHOW-STORAGE-CLASS.
The user can get information on the storage services of the existing volume sets with /SHOW-PUBSET-FILE-SERVICES and thus check whether there is a volume set with the desired attributes for his/her file.
The storage services can also be requested by means of direct attributing.
SM pubsets from the point of view of systems support
For further information please refer to the chapter "Defining of the performance profile" within the manual "System Administration" [10].