Right-click on the Persistent Storage Device (PSD) card and then select PSD Details.
In the contents pane, double-click on the System Information folder and then select File Systems.
With a table entry selected, click Allocation Failures.
From the Allocation Failures dialog box, you can view information about the allocation failures that have taken place in your system's file systems.
Allocation Failures (hrStorageAllocationFailures)
Number of storage requests that could not be honored because of a lack of storage space.
Note: Since this object has a syntax of Counter32, it does not have an initial value defined. However, it is recommended that you initialize this object to zero, even though management stations do not depend on such an initialization.