The STORAGESERVERMGT=YES|NO parameter in the IEAOPTxx member of SYS1.PARMLIB controls whether service class importance and goal information is passed to the storage I/O priority manager.
STORAGESERVERMGT=YES specifies that SRM should 
provide
service class importance and goal information
to the storage I/O priority manager. The default is STORAGESERVERMGT=NO.
Before specifying STORAGESERVERMGT=YES, verify that
your IBM® System Storage® DS8000® model incorporates the I/O priority
manager feature. Furthermore, verify if the service
option I/O Priority Management in the WLM service definition is set
to YES.
Throttle delays introduced by the storage I/O priority manager are reflected in control unit queue delays. Therefore, if STORAGESERVERMGT=YES is specified, control unit queue delays are not considered when the execution velocity is calculated for service class periods with a velocity goal.
If you have significant control unit queue delays in your installation, you might have to adjust the velocity goal of service class periods when you specify STORAGESERVERMGT=YES.
For further information about the STORAGESERVERMGT parameter, refer to z/OS MVS Initialization and Tuning Reference.