GROUP, NAME=JS3BATCH,MODE=JES,
BAR=16,JSPAN=ALL,
EXRESC=(*ALL,2,,DEMAND,DEMAND)

• You can define a maximum of 255 groups.
• When specifying EXRESC with MODE=WLM, the initiator count option, the initiator allocation option, and the initiator unallocation option are stored but ignored by JES3.
• BAR, which specifies a job priority barrier is stored but ignored by JES3 when MODE=WLM.
• JSPAN, as specified is stored, but ignored by JES3 when MODE=WLM.
• When the initial MODE=WLM setting is changed to MODE=JES, the stored values for EXRESC, BAR, and JSPAN will be used. This allows the installation to define a group as WLM managed for testing purposes, but still keep the initiator related information in case a switch to JES mode is required.
• You can define a group using the GROUP initialization without specifying any job classes.

• Do not delete a GROUP statement or delete a EXRESC from a GROUP statement that has active initiators unless you IPL the processor(s) where the initiators are running before the hot start with refresh.
• Device fences that were active before the hot start with refresh will be reallocated unless the definition of the device fence in the EXRESC or DEVPOOL parameters was changed. If the device fence definitions was changed, the fence will be reallocated after JES3 initialization completes.
• Initiator options (initiator count, allocation option, and unallocation option) are ignored if you specify MODE=WLM on the GROUP statement. If you switch from WLM mode to JES mode using the *MODIFY,G command, the initiator options specified on the GROUP statement will then be in effect.