If you want a system to access a pool storage group, you must ensure that devices on which the groups reside are physically connected to the system.
Use the VARY command to change the status of a volume from NOTCON to another status. If you want a storage group to have access to NOTCON volumes, physically connect them to the system, define the connection by changing the system status in the ISMF Storage Group Application, and activate the configuration that defines the connection. If you use the VARY command to change the status of a volume the change is made in the ACDS and not the SCDS, so the status will change to whatever is defined in the SCDS if an SCDS is subsequently activated.
When the job is executing, QUIALL has the same effect in a JES2 or JES3 environment. In an JES2 environment, the volumes become a secondary volume selection candidate through QUIALL. Secondary volume selection candidacy means that these volumes are still available for allocation, but less preferred than other volumes.
For more information about primary and secondary volume selection candidacy, see Conventional volume selection.
If the system uses JES3 to schedule jobs, you can use QUINEW only as long as other volumes are available. Before scheduling a job, JES3 verifies that all resources are available, unlike JES2, which schedules a job even if all the needed resources are not available. This can lead to a contention for resources, because a job running under JES2 can hold some resources while it waits for others to become available. Under JES3, if any of the candidate volumes are available, JES3 schedules the job and SMS selects the volume. Under both JES2 and JES3, SMS selects QUINEW volumes only as a last resort.
For more information about primary and secondary volume selection candidacy, see Conventional volume selection.