HP Storage Mirroring Software - Manual (Page 177)

Workload protection Page 176 of 677
Note: The Maximum disk space for queue and Minimum Free Space
settings work in conjunction with each other. For example, assume
your queues are stored on a 10 GB disk with the Maximum disk
space for queue set to 10 GB and the Minimum Free Space set to
500 MB. If another program uses 5 GB, Storage Mirroring Recover will
only be able to use 4.5 GB so that 500 MB remains free.
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Alert at following queue usage percentage—This is the percentage of the
disk queue that must be in use to trigger an alert message in the Windows
Event Viewer. By default, the alert will be generated when the queue reaches
50%.
5. Click OK to save the settings.