JES2 device status modes

There are 4 common device status modes that the operator might encounter

• Active - this device or initiator is performing a function right now
• Inactive - this device or initiator is available to do things, but there is nothing for it to do
• Draining - this device or initiator is still processing work right now, but will not accept another one, it will stop working after it finishes processing the current load
• Drained - this device or initiator has stopped and no processing will be done on it until the $S command is entered for it.

Some less common statuses include

• Halted - a HALT command ($Z) was issued against this device. Similarly to Drained, it can be restarted with $S, but the resources associated with it have not been freed.
• Starting - A z/OS START command was issues for the initiator, but the address space has not been created yet.