Netapp Question

Can someone please explain what is mean by the snapshot being 96% full on the aggregate?  The aggregate snapshot reserver is almost full.  Does this further snapshots may not be able to be captured?  

A Warning event at 09 Mar 12:07 Pacific Standard Time on Aggregate aggr2 on Active/Active Controller heraklesa.pcmt.local:
The snapshot is 96.00% full (using 176 GB of 184 GB).

Click below to see the source of this event.
http://HRKNAOM.PCMT.LOCAL:8080/dfm/report/view/aggregate-details/191?group=0

Click below to see details of this event.
http://HRKNAOM.PCMT.LOCAL:8080/dfm/report/view/event-details/17559?group=0

Click below to see all events.
http://HRKNAOM.PCMT.LOCAL:8080/dfm/report/view/events?group=0

Click below to see the source of this event in the DataFabric Manager server and access the related management page in FilerView.
http://HRKNAOM.PCMT.LOCAL:8080/dfm/report/view/aggregate-details/191?group=0&autoload-fv=21

*** Event details follow.***

General Information
-------------------
DataFabric Manager Serial Number: 1-50-014650
Alarm Identifier: 1

Event Fields
-------------
Event Identifier: 17559
Event Name: Aggregate Snapshot Reserve Almost Full
Event Description: Space utilization of aggregate snap reserve
Event Severity: Warning
Event Timestamp: 09 Mar 12:07

Source of Event
---------------
Source Identifier: 191
Source Name: heraklesa:aggr2
Source Type: Aggregate
Name of the host: heraklesa.pcmt.local
Type of the host: Active/Active Controller
Host identifier: 80

Event Arguments
---------------
dfKBytesTotal: 192604952
dfKBytesPercent: 96
dfMountedOn: aggr2
dfKBytesUsed: 184277668

--NetApp DataFabric Manager