About require constraints
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About require constraints

The "require" type of constraints specify that the allocation must select storage that matches all the storage specifications in the constraint. Therefore, the require constraint acts like an intersection set, or a logical AND operation. If any of the specifications cannot be met, the operation fails. The attribute names to specify require constraints are:

If any storage-specification is negated with !, the allocation excludes the storage that matches that storage specification

Note:

If the require type of constraint is provided with the same class but different instances, then these instances are unionized rather than intersected. That is, the allocation selects storage that satisfies any of these storage specifications (similar to use type of constraint).

See Interaction of multiple require and use constraints.

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