EM Alert: Critical: server - Disk Utilization for 1 D: is 99.8

in the last day's i receive the following error message every 2 or 3 hours:
Metrik=Disk Utilization (%)
Disk Device=1 D:
Zeitstempel=12.04.2010 12:29 Uhr CEST
Nachricht=Disk Utilization for 1 D: is 99.81%
Regelname=Host Availability and Critical States
first i thought it's because the "db_recovery_file_dest_size" parameter was to small, because it was set to 10gb and the FRA was almost 10gb. then i raised the parameter (without restarting the database), but the same problem after a few hours.
select * from v$recovery_file_dest;
d:\FRA\     21474836480     10648922624     10073876992     458
is it necessary to restart the database after reseting this parameter?
thx for your help!

There are many bugs on metalink on this.
Better to raise a SR with OSS.

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