Storage system values: When maximum usage is reached

Specifies the action to take when the storage pool has reached its maximum. (QSTGLOWACN)

When maximum usage is reached, also known as QSTGLOWACN, is a member of the storage category of i5/OS™ system values. You can use this system value to specify the the action to take when the system disk pool has reached its maximum utilization. To learn more, keep reading.

Quick reference
Location	In iSeries™ Navigator, select your system, > Configuration and Service > System Values > Storage > General
Special authority	All object (ALLOBJ) and security administrator (SECADM)
Default value	Send message to system operator and message queue
Changes take effect	Immediately. However, if the available storage is already at the maximum, the change will have no effect until the storage has dropped below the maximum and then reached the maximum again.
Lockable	No

What can I do with this system value?

You may specify the action to take when the available storage in the system disk pool (also known as auxiliary storage pool) has reached the maximum specified for Maximum system disk pool usage.

You may specify any of the following actions:

Send message to system operator and system message queue (*MSG)
Message CPI099C is sent to the system message and system operator queues. This message is also sent for the other actions.
Send message to service users (*CRITMSG)
Message CPI099B is sent to the users specified in the service attributes to receive critical messages. Only users who are signed on at a workstation are notified.
Run registered exit programs (*REGFAC)
A job is submitted to call exit programs registered for the auxiliary storage lower limit action (QIBM_QWC_QSTGLOWACN) exit point.

No action is taken if the system is in the restricted state.

If you select this action and available storage reaches the maximum limit, you cannot start a subsystem while the system is in the restricted state.
End system to restricted state (*ENDSYS)
The system is ended to the restricted state.

No action is taken if the system is already in the restricted state.

If you select this action and available storage reaches the maximum limit, you cannot start a subsystem while the system is in the restricted state.
Immediately power down and restart system (*PWRDWNSYS)
The system is powered down immediately and restarted.

No action is taken if the system is in the restricted state.

If you select this action and available storage reaches the maximum limit, you cannot start a subsystem while the system is in the restricted state.

If the available storage has reached the maximum limit during a restart and the action is not Send message to system operator and system message queue, the system will come up in the restricted state.

When the following conditions exist:

The available storage is below the limit
The action is Run registered exit programs, End system to restricted state, or Immediately power down and restart system
The system is in the restricted state

you cannot start a subsystem until:

The available storage is reduced.
The action is changed to one of the first two options shown above.

No action is taken if the following occurs:

Available storage drops below the limit.
The system is in the restricted state.
The action is one of the last three options shown above.

The action is repeated every 30 minutes if the available storage is still at the maximum level.

Where can I get more information about this system value?

To learn more, go to the storage system values overview topic. If you are looking for a specific system value or category of system values, try using the i5/OS system value finder.